I think I'm gonna go with the 4.3 it seems to be the best motor for this build for everything to work right also thanks dab list for pointing that out about low end torque
It has vortec heads I'm just saying from what I've read on them that's what a lot of sites say any way I really don't know I have no experience with a 4.3 well any v6 for that matter
It needs to be gm though so it will bolt to my t5 5 speed so. The transfer case will work its. I'm setting my 620 body on a s10 frame becuz my frame is trashed it's a lot of fab work but I can do it