We run a 1990 S10 509 BB twin VS Racing 78/75 1.25 A.R . 60mm gates IRD blow thru carb Revmax billet 10.5 3500 convertor built for the setup FTI level 5 TH400 3.55 gear we have it on 25lbs of boost truck is a street monster . We ran a pair of GT45 turbos in the beginning and took them back off .
How high are the rpms at part throttle? The 3.55 gears probably Help alot that's the next thing I need to change . Pull the 4.11 gears and swap for 3.55s or 3.36
