Nova question..

[Chevy350]

The clamshells on the subframe are the same as the V8, so you just have to get the correct length/width outer shells on the V8 block. Worst case scenario, you have to move the mounts on the subframe some (multiple holes drilled already), but it's no big deal.

I have a 400cid SB lying around that my friend is going to borrow from me this summer, so we'll have the same swap coming up this spring