Hi guys I have a 1967 V6 225 in good shape. block casting 1381623. heads B1358676R The crank is set up with a pilot bearing for a manual transmission. I need to use this engine with a TH350 auto. So here is the question: I am pretty sure I can have the crank machined to work with an automatic transmission's torque converter. HOWEVER, I have access to a good crank from a 1983 231 (3.8L) Buick V-6. could I just swap the 3.8L crank into the 3.7L block? same bore size different stroke right? any reason the swap wouldnt work? what are the big differences between a 225 and a 231 V6? Thanks for any input.