afaik, if your running that pump, it should be sufficiant... stock "LS" style motor pump or ac delco 381 or walbro 255 will all work just fine on relatively stock motors. shouldnt drp much when WOT. if youve got a big motor, thats a diff story. if not, then it sounds like you got a restriction somewhere, or your pump is failing, or....
make sure no fuel leaks. check/change filter, check pressure reg on rails. there is a tiny filter in the reg also that might be clogged... (depends where your gague is at...
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