Unlike all the Holley instructions and other advice, you don't need the fuel pump near the tank. My mistake was following Holley's manual when I installed Pro-jection on my 65 Newport in 1996. I put their gear-rotor pump on the frame rail in front of the leaf spring, below the floor (no such space on an A-body). Besides making a racket, if failed at least once (pickup restriction), and that wasn't a nice place to get to for repairs. I then put a small electric rattle pump as a "pusher" there, with the gear-rotor low in the front engine bay. The rattle pump starved the main pump, so I put a Holley rotary vane pump in the rear. That worked until I got the brighter idea of getting a 15 psi spring for the vane pump and ran that alone, which worked for years. When it leaked (porous casting it seemed), I tried just the gear-rotor in the engine bay. Worked fine as I figured it should since gas just pours out of the open 5/16" supply tube. Ran that way since and did similar in my 65 Dart (see my post). In sum, you might try losing your mechanical pump.
