Yes. In a carbureted car, the fuel pump only needs enough pressure to get the fuel up to the carb and overcome the weight of the needle valves without the float pressing them closed. Too much pressure and the fuel will force it's way past the needle valves, and then you'd have gas all over the place. Venturi vaccuum is what determines how much fuel is needed, and 6psi @ 500rpm and 1pt/20 sec should be plenty enough to keep the bowls filled for a 600 cfm carb.
'65 Coupe, 302, Autolite 4100, C4, 3.00