warggod

When im driving normal the car asks fine but when i give it gas to about 3000 is where it starts like cutting out back firing in the exhaust but not loud the timing is fine the carb is set with a vacuum gauge thats fine am i getting enough gas will that do it

this is what i got
302 stock heads exhaust humps ground out e303 cam stealth manifold 600 elderbrock

what about vacuum advance it goes from 12 to 20 with a little gas is this fine