5/16" Fuel Pump Inlet for 340?

Thanks 340doc. My motor is 30 over, 10.5 to 1 pistons, 1800 to 6000 cam, 2.02 valves. It has an air gap intake and doug's headers. Edelbrock tech recommended a 650 carb (have not ordered yet). It's intended use is just for weekend fun and cruises. The Comp cams program claims I'll be in the low 400's horsepower range.