Harry, a Holley 950 is basically a 750 with an 850 base plate. It is a marketing gimmick, it does not flow 950 cfm. Also, an 850 carb is a race calibrated carb from Holley; not a great street carb. Now, I don't know about Pro Systems and what they do, and maybe they have a real 950 cfm carb, but if I were you I'd be looking at one of the Holley 1000 HP carbs. I don't think they flow 1000 cfm either, but from personal experience I know that they are good on 600-650 HP engines - Jay
