I have an Edelbrock Performer RPM high performance mechanical fuel pump for sale, part # 1713. This was on my car for about 2000 miles. I recently upgraded the car to EFI and I no longer need it. It is rated at 110GPH/416LPH at 6PSI. I ran this pump with a Barry Grant Demon carburetor, an Edelbrock Thunder 800CFM carburetor, and a Quadrajet 800CFM carburetor with no problems. You also don't need a pressure regulator for a Quadrajet because the pressure is perfect for the Quadrajet. These sell new on Summit for $139.95 and I am asking $80 plus shipping.
https://www.summitracing.com/parts/edl-1713
Thanks,
Dale