I'm feeding 410cid. Full ported heads ,solid roller, 750 carb, tti step headers, 4 spd, 3" pipes 3.73 gears....I rev it 6800
I use a stock 340 replacement fuel pump.
Think about how long you hold it at wide open throttle. Save your money for good headers, cam, heads, Etc and don't buy the fancy water pump, fuel pump, alternator and all that because the stock stuff works Beyond stock stuff