[JSeery]

The blocks are all about the same and the only real internal difference is the crankshaft throws, Ford vs Mercury. Of course the pistons have to match the crankshaft. The later 8ba engines also had rotator valves. There are part differences, such as different heads, but they interchange. If it has the original 8ba distributor, then the carburetor needs to be the correct one for the vacuum advance to work properly. 8ba starters should all interchange (actually, 32 thru 53 should interchange).