Just to throw another option out there, had you considered using a
VetteWorks type adapter, so you can run a factory fuel pump / regulator / gauge sender?
Not sure it's going to be any cheaper but I like OEM solutions when I can find them.
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Over my head"
1957 Chevy 3200, big rear window & 6 lug.
Front disc, power steering, Vortec 4.8 / 4L60E swap, hydro boost brakes & patina.