Thanks for the replies. My Uncle was telling me about the predator carbs and I had actually forgotten about those til he said something. For my application Jegs Tech guy and by my using this formula i found on the web (cubic inch of engine X max rpm / 3456 = max cfm required) all point to a 850 cfm. This is a 93 octane street car but im gonna try to take it to the track when i get it runnin rite