I've got a 1988 IROC w/ a 700 4R. The engine has been rebuilt using forged flattop pistons, heads have been ported and polished, intake has been port matched, running a 510/510 compucam just enough so i dont have to change the intake or mess with the computer. My question is if i put a 2500 stall, adjustable fuel pressure regulator, and a 150 shot how much do you think I will nock off of my 1/4 mile time? Current best is a 14.46 on street tires

 

What rear end gears do you have? I belive that would be able to knock a full second off, but you might loose traction with street tires when you spray....

 

i have personally seen a gain of 20hp with just a fuel pressure adjustment, the porting and polishing will help the camshaft live up to it's potenital , and the 150hp shot will make a huge difference. just a questimate (if you can put it to the ground) i would think a 13.2 13.3wouldn't be out of reach.