Not trying to be mean or anything but there no way that pump pushes that much fuel...it's a 20-30 GPH pump...the Carter super race/street pump with 6 valves only pumps 50-60 with that 1/4 pipe in/out.
The very biggest 6 valve with 3/8's pipe in/out with the huge body is a 90-120 depending on how large the valves are inside...
I've gone through the mechanical pump issue in the past and I'm speaking from experience.