if u r turning 6000 rpms then a 750-800 cfm i used a catrr thremoquad on my 400 i was turning 6-6500 i also had 95# pf oil presure (there is a rule of 10# of oil pressure for every 1000 rpms) if u run lower oil prssure u run the chance of staving the bearlings of oil. i have seen guys blow mopars up. but do as u like i really dont think fuel flow is the isse i thonk the camshsfy dose not match the rest . i only used mopsr performance cams Now how much faster do u want to be?