The 4.3CPI, 4l60E and NP233 are going to be a money pit to install. Been there and done that. The CPI has a high pressure fuel system that will increase the expense. Also has a much higher rpm torque peak. The electronic NP233 does not have a neutral for towing.
Bob Shaw


87 Raizer, 4.3V6, Mod TH700R4,231CHD, detroit rear and LSD front, bouncy seats, 2" lift and 32x15 BFG MT tires.