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The C4 has a removable bell housing so worst case he would need to swap the bellhousings.

Comp cam blanks are not the problem. The lifters are the problem as all the ones that Comp sells are made in India. I would use lifters made in the USA either by Autolite or Motorcraft or Crower. Look for old stock on eBay or buy the lifters from Crower.

Your '66 transmission WON'T bolt to the new engine. The 250 cu. in. engine has the same bell housing bolt pattern as the 289 would have. That also means that the flex plate and torque converter do not bolt up either. You'll have to use the transmission that came with the 250.

Sorry for the bad news.

Frank

Pretty sure a 1966 Mustang would have a 200 CI six cylinder engine. Maybe that is what you meant. Anyway the early six cylinders used a different bolt pattern unique to them and it will not work with the 1970 era six which has the same bolt pattern as the 6 bolt 302 / 289 / 351 engines.

     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.     
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The thing is, single 4V ratings will not be the same as an 8V rating for the same carburetor. I don't know the formula off the top of my head but the number is less.

Seems like the Carter carbs would be rev limiters too.

Best move I ever made was when I left California. Nice place to call a former home. Would not want to visit.

Last time I sent one in was maybe 6 months ago. At the time it was Booster "Steve" as Dewey had retired. If Mark is now the owner I think I would still send them my booster for rebuild. They did a great job on the last 5 of them.

It's a tough call because I have R12 and you likely do not. If I had to use R134 I would install their complete system. For me the AC is more important than the heat. If I lived up north somewhere my answer might be different.

Joe restored a number of carburetors for me, going back to the 1990's. He did a pair of 2804 / 2805's for me - twice! Great guy and the carbs always worked fantastic. I will miss him.

The problem with either the Vintage Air or Classic Air kits is they do not use outside air at all. Both of them block off the air inlet and strictly recirculate the air in the cabin. The factory unit uses outside air.

The Classic Air system also does not have a very good heater, particularly if you have a console. The passengers feet get warm. The drivers feet stay cold.

Either one cools fine particularly with R134 coolant. The factory system works better with R12 as R12 is much more efficient. R134 needs a bigger condenser and a bigger evaporator, both of which are provided with either of the aftermarket options. The factory unit does not have either a bigger evaporator or a bigger condenser so performance with R134 is not as good.

Did any particular photo in that collection stand out to you? 

The ceiling treatment in some of the photos is something i don't remember. Maybe I never looked up there. I just remember the ceiling being very high. Maybe the fabric covering was wasted on kids like me. We just accepted adults smoking everywhere. It was a very different world.

I was there. From 1965 - 74 the Texas State Fair was pretty good. I remember the girls (and guys?) who were the speakers by the cars were pretty unpleasant. I went a couple years ago and the Automobile building was pretty much the same except the prices were astronomical!

I think the original motor is more important in a more valuable car. Let's face it, the 1968 GT350 is the least desirable Shelby. A more desirable Shelby would be the 1967 GT500 - if one of those has its original 428 it is unusual because most of them were blown up long ago. Maybe in that case it would affect value - most folks would prefer a roller motor 347 in a '68 GT350. At least I would. 

It does not look like Venezuela to me. I've been there many times - not nasty enough. Maybe Mexico City?

Looks like there are a lot of both new and rebuilt compressors on eBay. I will take your hint and swap the tag Bob.