Probably not what you want to hear but I had trouble with mine making similar power all the way up until I went Tanks Inc with an in tank pump.
It’s not just the pump, but the better tank with baffles.
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1967 Firebird 462 580hp/590ftlbs
1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455
Owner/Creator Catfish Motorsports
https://www.youtube.com/@CatfishMotorsports
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