well, here's my problem my holley 750 cfm carb it's allway making my engine run really rich,my exhaust i vary smokey and when i punch the gas quilkly the carb pops. my engine is newly rebuilt it has a comp cam magnum 270H series cam with a 224 dagee duration and a .470 lift,edelbrock rpm intake manifold,G.M. hp heads with 2.20 intake valves and 1.60 exhaust valves,holley 750cfm carb, my compression is 9.73:1,
at first i thought i had a blown power valve so i replaced it,no improvement so i put a power valve plug in my carb still no improvement, i played with the mixture screws no changes. i put some new spark pluges in and readjusted my roller rocker arms, because i looked at my vacuum gauge is read around 15 hg but was vary bouncy wich indacates sticking valves or ignition miss,i reset my ignition timing to 12 drgrees. could my carb jetting be too big?
any suggestions would would be greatly appreciated.