The 60-62 chevy trucks had a U shaped front motor mount for the v8 trucks plus the the two trans/rear motor mounts instead of side motor mounts like in the later trucks. Also the transmission bellhousings are different between 6 and 8 cylinders. I swapped out my 235 for a 350 and for now still have the 3 on the tree. The question between 6 & 8 is personal preference. I just love the sound of a v8. Have heard 235's with split manifolds and duals that did sound neat though. Good luck.
