If you can sit at idle not moving and rev the engine and watch the fuel pressure drop then you have some serious issues.

First, put a timing light on it. This tuning by ear stuff is total BS. You probably have it running at 30 degrees initial. Get yourself a timing light and a vacuum gauge before you do anything else and start from there. Tune with the vacuum gauge to get the best vacuum at idle. I had to set my initial timing at 20 BTDC and 16 degrees of mechanical advance. With gas today the timing really has to be bumped up. What are the cam specs? That will make a drastic difference in where the initial timing needs to be. Also will affect which power valve is in the carb.
Listen to these guys and learn.

Second, what kind of volume is that pump rated for? It may be 9 psi and 3 gallons per hour.. There is no way you should just rev the engine and see the psi drop.