Another thought; an SS racer will kill for .02 ET. If he was running the headers that came were in the car he raced, They are probably as good as it gets, but might not show a lot of improvement. The best answer is try it and see. Be ready to tune for them, and find out EXACTLY what stall you have. I was fooled for years because I went by a tach. I am no small block guy, but hear they are sensitive to converters.