Actually this dude has a vortec 350, they stopped making the TBI 350s in 96. You for sure need to re-gear man. I used to have a 96 Z71 with 33" goodyear wrangler mtr's and it was a turd with the 3.42's. I guarentee you your not gonna walk away from anybody in a race with that combo. I threw in some 4.10's and it was a night and day difference. The vortec 350 is limited by the poppet style injectors it has. That will be his main limitation if he tries fixing it up. I agree with the others, just do a motor swap and be done with it.