I have a Holley 800 C.F.M. Spreadbore carb . It is a model 4165 Carb No. 6710, it has mechanical secondaries. The previous owner ripped the choke out and the thing run's rough. I haven't torn into it yet but believe the power valve is blown .The carb really pop's before the engine warm's up and is very rich. Does anyone have any experience with thes carbs? I am thinking about boning the carb and getting a 3310 . It will be going on a 70 454 , 425 H.P. Big block. Any input would be greatly appreciated.I don't even know what size the jet's are yet.Just bought the car last week.