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I was told online it's a marine engine

     Yes, the block does present several of the characteristics typical of the "Marine" application blocks.   

     Scott.

     None of the names being bantered about actual "make" the camshaft cores/blanks or lifters; each and all are at the mercy of product quality and availability from the 'few' suppliers remaining, and yes, that includes "off-shore" suppliers.   

     Scott.

   

We can find it in other place: https://cnc-motorsports.com/comp-cams-31-110-5-factory-muscle-solid-flat-tappet-camshaft.html

      Well not there anyway!  But they'll take your credit card and probably "run-it" for the order, and a couple weeks later, with no signs of a camshaft on your doorstep, you'll be chasing them for a refund to your card! 

      Normal! 

      Scott. 

. . . . . . the inside gasket between the axle flange and the backing plate is a must.
 . . . . . . the outer gasket is not as important and that many don't install this one.

    I do have my own opinion on the subject, but I don't want to lead the conversation, rather it's more interesting to explore the thoughts of others and the purpose of my posting was to perhaps excite some original thought into the subject of just what useful purpose does "the", but since you brought it up, "either" gasket perform? 

    B.T.W. : 

https://www.virginiaclassicmustang.com/65-73-REAR-AXLE-BEARING-RETAINER-GASKET-M140-V8-MODELS-P517.aspx

https://www.virginiaclassicmustang.com/65-73-REAR-AXLE-TO-BACKING-PLATE-GASKET-M141-V8-MODELS-P518.aspx

    Though the copy-paste process was correct, in reality if considering the functionality engineering intention, this solely of the gasket design, not the idea in its' entirety, one of these gaskets is wrong if only for fluid control and routing reasoning.   

     So think about it; if only because you just don't want to follow the rest of lemming off the cliff!   

    Scott.

   

To close out this thread . . . . . .

    Well...........let me provide this thought:

    Yeah I know, it's really not what the O.P. inquired of, other than by extension whether or not if one really needs to even go looking for 'em; so what is the purpose of this gasket, what function does it provide and is it really needed? 

    Scott.
   

Any time I see where a Business gets bought up by a "Private Equity Group", it rarely ends well, especially when the Buyers don't have any or much experience in what that Business does. 

    In case you haven't noticed, it would seem the bulk of the big name "Automotive Aftermarket Performance Parts Manufacturing Industry" has been picked up in the same fashion. 

    And I would have to agree.............. the future doesn't look good! 

    Scott.

My guess if SHELBY thought that they were good enough for Chryslers 413 Max wedge engines, they should work well with his high strung 289s?

    My guess is that it was more a case of what was available, reasonably applicable and affordable (cheap!  ); and as 1963 was Chrysler's last hurrah with these carbs, so there might have been some leftovers available at Carter languishing in the warehouse with no apparent destination that might have been had at a discount? 

    B.T.W. These #3258 & 59S's were for the 1962-63 383 & 413 c.i.d. engines with the "Long-Ram" & "Short-Ram" (still "long" )  over the valve cover, left & right, intakes (also known as: Plymouth's "Sonoramic Commando", Dodge's "D-500 Ram Induction", and over at Chrysler "Ram Induction"); the "Max-Wedge" 413's utilized the #3447 AFB's, and were approximately 600 C.F.M. carbs. 

    Scott

     No, "rolled threading" is not a cutting process, more of a displacement/compression process, with no material being separated from the parent whole.   

     Scott.

    Yes, I realized that from the photo previously; and I do realize that the shoulder is still of a greater diameter than that of the minor thread point, so not the worst case scenario, but it 'still' is not a recommended procedure. 

    Scott. 

    To the best of my knowledge those studs are a replacement from the original equipment; that may present the proper threading but might prove a tad long, so be careful and measure both the internal threaded and overall lengths of any intended "capped-nuts". 

    Generally those with the elongated type shoulder engineering protruding thru the axle flange face are intended to provide location of the disc brake rotor (generally drums utilize the axle end "register), and considering the engineering appearance, for a vehicle of the of past applications, for the front wheel positions, in the period of vehicles which were equipped with mixture of disc & drum braking systems. 

    But also note that it is not considered a good practice to machine studs in such a manor!  This as they are of a "forging" with "rolled" threading so as to preserve the materials "grain-flow" which enhances the strength and durability, which is compromised with the machining process.    

    Scott. 


   

Seems like the Carter carbs would be rev limiters too.

I would think over 9oo cfm for a 289 would be sufficient-

     In most instances (3258 & 59S ) the AFB carburetor utilizes an "Auxiliary Air Valve" on the secondary venturis, this regulating air flow volumes regardless of the mechanical linkage attached secondary butterflies' positioning and this is intended to solve the problem of possible excessive carburetor capacity potential; but if not with some tuning effort, will also often limit the engines performance capability to some degree.   

      And of those carburetor types which require an air pressure differential function in order to perform the work of operating throttles, generally these will provide less performance potential.   

     Scott.     

. . . . . ., plus they weigh more than originals.

    Yeah, the frigging things are boat anchors!   

    Scott.

      If the aluminum pan attached to your vehicle is an "original" or even "period aftermarket", I'd be fixing that!   It's very repairable, though I shouldn't belittle the challenges of attempting to clean suitably for welding of aluminum castings that have been exposed to oil, under heat and vibration for decades, but we've done it may a time. 

      Besides, the newer "re-pops" 'suck'!   

      Scott.

"Every Shelby has a value". Where would you put this one?

     But if you consider things logically, accurately, a "rebody" in the manor of the Mustangs' unit-body construction means this isn't the Shelby vehicle it purports to be, rather it's a different car (Mustang) with 'some' Shelby "stuff" bolted on it!   

     Scott.

A 'Rebody" will kill the value of any car ...........

    'Should', but these days you never can tell, and is why it keeps being rerun through the auctions, just looking for the "Big Fish"! 

    Scott.