Fuel Fluke

Just my 2 cents. I would put a regulator between the pump and the pressure gauge. The Holley carbs don't like 7.5psi. That high pressure causes the seats to fail. In-turn fuel continues to enter the bowls. Lower the fuel pressure to about 6-6.5 psi. Then reset the floats. It sounds like you have a flooding problem. As I said, just my 2 cents worth.