The writing was on the wall a couple of years ago: Ford's tooling for the N351 cylinder head casting was wearing out, and if something wasn't done, that casting stood a chance of going the way of the ...
For the most part, the Gen-I and II Chevy small-block has been the same basic engine since 1955 (except you, 400, you made things weird), but Ford V8s do not play by the same rules. Asking for a "Ford ...