well i have a ZJ right now for trails and stuff thats pretty much good to go; so the YJ would be a project. i'm not a fan of the 3 year builds though; i'd like it running by summer you know? so i guess what would be easiest to get it running.
plans wouldn't be for anything bigger than a 35" tire, and 8.8" rear.
right now i'm thinking a 5spd. XJ for a donor. i just don't know if the mounts would line up.. guy selling it says it had a 4l in it before, but who knows.
If you decide to go with the xj, the block brackets on those are different than the brackets on the yj motors. So, you'd need yj brackets to bolt it to the original motor mounts in the yj. The Cherokee fan belt routing is different also, another easy to solv problem.
Personally, I'd slap a 5.9 in there. That's likely my next swap if I can locate one on the cheap.
1994 Wrangler...4.0 AW4 swapped, sye'd, 5.5" lift and 33's