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look at the coil or ignition box ? if you have one also sounds like the fuel is getting hot ?if yor running a hei ignition check for 12 volts .were is your plug gap at

HOLLEYs will take abit more fuel psi then the old afb or edelbrock they do not like hi fuel psi they will FLOOD

if your runing that big cam 588/588. 274 @050 and 107 lca that 6.5 PV is to big should be a 2.5 or a plug if a plug jump up about 10 jet sizes up and the carb is small for your engine so i would bet...