Eddie carb problems

Okay Thanks guys, we started the project to install a 1/2 spacer I bought, but once we seen the fuel pressure drop before the carb, we didn't think we needed it. If it was my fuel pump, which I just replaced, why would it only malfunction only when it is hot. When I first start the car, the fuel pressure is great. If I only go about 10 miles and it's a straight shot, my fuel pressure is fine. My fuel press. gauge is before the carb, and it shows low pressure at these times. Where would I drill the hole for my fuel tank or cap, how does this help. (P.S. When I say hot, I mean my motor is only about 170 or 180) Thanks!