Well, after 20 years, the 350 in the '81 Chevy SWB 1 ton is getting tired. It has a TH400 (insist on keeping) and a Doubler on order. Tires are 39.5X18, 5.13 gears. Has 795 cfm Q-jet, 9" lift, major fender trimming, no need to exceed 65-70 mph. Live in CA so it needs to smog, but I have lenient mechanic. I was thinking carbureted 383 since I already have MSD, other goodies. I see alot of steep angles, so TPI would make me feel more secure. Big block might be too heavy for off-camber scenarios. Please share your input!