Carburetor trouble

Fuel pressure consistently runs at five pounds in town and on short runs once I start accelerating hard on long runs the fuel pressure starts bouncing between 0 and 3 until something like the carburetor loading up and choking out and I smell gas then the fuel pressure goes back to 5 this continues to happen until I stop for a couple of hours then it’s back to normal with no problems
Also I have a crank trigger with the distributor locked out, I’ve tried different fuel pumps still the same I think it lies in the carburetor