thanks guys. ok im not sure of the fuel pressure at 1/4 lights im running 7 psi at carb with a bg220 system im only running 1 inch 5/8 primaries with 3 inch collector and 3 inch race magnums. im running 28/12.50 et streets with 12lbs of pressure. im running the 950 vacuum because it was all i could get on a budget but i have a 950 dbl i can borrow. im sure the headers are hurting me. IT IS IN A 91 S10 SO ITS HARD TO GET A GOOD AFFORDABLE HEADER FOR IT . BUT IM GOING TO SOON .I MIGHT TRY A 456 BUT THOUGHT IT MIGHT HURT BUT THIS ENGINE SEEMS TO LIKE RPM. I DO DRIVE IT ON THE STREET AND TO AND FROM TRACK. IM NOT AFFRAID OF DOUBLE PUMPERS ON THE STREET . I WILL TUNE IT PERFECT . I JUST LIKE HEARING FROM SOME GUYS WITH A LITTLE MORE EXPERIENCE. THANK YOU