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Chris,
Assuming that you have the original Ford / Holley carburetor, you don’t want the pressure to be more than about 5 PSI or the float and needle valve may not be able to shut off the flow of fuel when the bowl is full. Something like 25 GPH ought to be plenty for a stock 260 (164 HP).
Before you replace the fuel pump, have you checked for the dreaded “black flakes” clogging the fuel line?
