Hey 4XToy, I'm just starting a build just like you. Looks like you have some great ideas.
I bought a rolled '91 S15 with a 4.3 TBI today, and will be following this build close. I expect you to be the guinea pig, and work out all the problems, so that I don't have to. My project involves an '89 Trooper, Wagoneer Dana 44, probably a T350, and a NP 241 t-case, with 4 in lift, and 35s or 36s. Good luck on yours, I know I'll need it on mine. Tim.