I have a 1953 6500. I have a 1987 TBI 350 bolted to a 1965 bell housing, out of a c10 2wd. Then that is bolted to the original sm420. It worked great and I didn't even need to modify anything. I went to a junkyard and got a crossmember out of another c10 2wd. The whole combination is great!, now I am ready to bolt it in, so let me know if you have a questions or advice...