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Thanks for the welcome
I should have said A scratch blocks with reinforced web were dated Nov 66 through May 67 NOT 7B-7E.
Misquoting my own printed data. it's all down hill from here 


https://www.428cobrajet.org/id-block

A scratch blocks with triple web were cast 7B-7E. Prior dated 428 castings are single web A scratch and castings dated after were C scratch continuing with triple web.
The Craigslist block is pre reinforced crank saddle (triple web)
Kerry

You do not want a radiator from Modine with the engineering prefix stamped on the side strap if that is the location you are referencing. These are not for San Jose plant cars.
Side strap rads below all have different physical dimensions ZE shortest
ZE Mustang/Cougar
OE Midsize Fairlane/Comet
AE Fullsize Galaxie/Meteor