HELP with fuel system

[500hp club]

I have a ZZ502 566.9 hp @ 5800 605 Ft tq at 4000 in a 74 Z/28 camaro. I used a stock fuel tank and put a comp enginering sump in it mounted the fuel pump (Barry grant 220 HR) in the area where the muffler was. Its mounted as low as I can get it with out being to low. -10 fittings and hose from the sump to the pump the filter is attached to the pump, -8 out of the pump to the carb regulator that came with the 220 hr pump and - 10 return to the tank. the pump runs hot and when I am crusing it cuts off and i have to poor ice water on it or wrap a ice soaked towel arround it then it waors for a while and the same thing happens. I too the car out today and it seems to be happening more often i lowered the pump like BG said when i called them today but that didint help. .....Oh and I am using the vent from the stock sending unit to vent the tank ? What gives please help has anyone had this problem? Forgive the spelling and gramer im tired and dont feel like messing with it.