I ran an old school Hilborn 2 1/16" butterflies 8" stacks on a 451" low deck. I made spacers so it would put the stacks vertical. Did very well with set up, was very consistent. Tried to sell the car (70 Challenger) and no one wanted it with the injection. Put the carb. back on it and slowed it down 2 tenths. That was on methanol with the injection and race gas with the carb. Am sure not every set up responds that well. But am running methanol in new car and probably won't ever go back to race gas.