I think Jummy2car's question was more rhetorical directed to the original poster, more of a "Why put a Chevy in a Plymouth" I say its your car, do whatever you want to it, I have a Ford with a Ford engine, a Chevy with a Chevy Engine, but I also have a Chevy with a Pontiac and a Ford with a Chevy... I think this link will take you in the direction that Zipolean was taking you: http://www.butchscoolstuff.com/55-56-ply-dod-sb-chev-eng-trans-conversion-2192cpb/