1991 Chevy C1500 RCSB Version: I Have A Problem

[LT7A]

Another one? Hahaha. What a great find. If you find another rcsb like that up there, let me know. A neat truck and a fun road trip home. I'm surprised you don't feel like you're getting better power out of your TBI 350s. Even with the stock round cam, they respond so well to minor tweaks like the exhaust you're doing and an open element air filter with a salad bowl underneath. I haven't even done the rest of the ultimate TBI mods and mine runs much stronger than new with 235,000 miles on it. Are you freeing up the air intake side? Maybe it's gearing? The mods seem to really work well with the 373s I opted for.