I have a healthy, all iron 440 in my super heavy (5300lb. with me aboard) '76 Gran Fury station wagon, that I was running a 4781 Holley 850DP on. I thought maybe it could stand some more airflow, so I bought a ProForm 950HP center section to try on it. The choke tower removal alone was something I wanted, but upon inspection of the venturis, I was dismayed at their smaller size/area. MUCH smaller on the 950, what?? I tried it anyway and BINGO, over .1 reduction in ET!! I think the velocity from the smaller venturis really complimented my overweight application. Now I would use an HP950 over a 750 in a stroker small block street/strip application, or on a mild big block without hesitation.
