I just purchased a Superformance Cobra replica with the following: 460cu in .030 overbored, Holley 850 double pumper 4781-4150, Edelbrock Performer RPM dual Plane High Rise Manifold, Edelbrock Alum heads 10-1 compression, 2.19 int 1.76 ex, comp cams 280 degree cam .520 lift, 1.7 roller rockers, Hydraulic lifters, 3.73 rears. The carb on it is running way too rich and I would just as soon go to a different Holley carb, (not a dual pumper) I want reliable street performance. Would a 780cfm be sufficient or would I have to go to an 850CFM Any help would be greatly appreciated as I don't want to do this by trial and error which would cost me more than I care to think. Thanks in advance