engine cutting out down track after in 3rd gear!

Motor cuts out kinda like rev limiter. .. sorta...popping and not gaining rpm or speed.
New fuel tank , 3/8 sending unit and 3/8 line all the way. Carter high volume pump. Thinking 120gpm. And 14psi I think if I recall correctly. Haven't hooked my fuel pressure tester and ran it yet to see if fuel pressure drops. I forgot that I had a piece of junk Mr gasket regulator on it that only went to 6psi. Until I was at the track. When I went to break the engine in I could not find my Holley reg. I've got to buy One.
And yes this car should be a lot quicker! I had traction problems also. Couldn't hook. One run it was still breaking lose 40 ft down the track.