[My72BB]

Actually...No Big Blocks until at least 1982 or 1983...No Big Block 4wds ever in the 70's. They did do T-400's in 4wd's starting in 77/78 but always behind a 350 or 400 small block.

Now a lot of swaps took place especially after 73 because the motor mount perches were the same for Big or small and a lot more manuvering room. My dad had a 73 4wd 3/4T and bought a 74 2wd with Big Block just do the swap. Very clean swap other than the 454 was in front of a T350...All I can say is the Tranny shop really like our swap cause we ate a 350 about once a year until he sold it...