[olddog]

To clarify one of your questions, Ford produced FE blocks with bores 4.00," 4.050," 4.130," and 4.230". The (shell) thichness of the cylinder walls of the smaller bores are similar to the thichness of the larger bores, most likely to keep cost and weights similar. There simply is not enough meat to bore a 4.000" block out to a 4.230". So yes, each block is a different animal, in terms of the bore. Otherwise most FE engines have similar dimentions.