Which Fuel Pump?
Only with a regulator!
Otherwise a cutoff pressure of 7 psi or less is the way to go.
There's a
page of pump info including flow and cutoff on my website. In short, for non-rgulator application, the one Carter used to call "Super Street" M6902 is a better choice than the "Competition" M6270 when used without regulator.
Stock pump should be adequate even with stock 5/16 fuel line IF the line and filters are in good shape. When I first rebuilt my 'cuda with a 340 (around 1990) it would run out of fuel at the end of the 1/4 mile. Confirmed with fuel pressure gage mounted on the cowl.
With too much cutoff pressure, it would also occasionally flood the carb at inopportune moments. Even though it had been an Arizona car, the root of the problem was the fuel line around the top of the wheelwell. Changed the line to 3/8 stainless and using a lower pressure and no problems since.
My friend Rob's '68 'cuda runs quicker than mine (in the 12s) and is still using the original 5/16 fuel lines with no problems. From that I conclude that the stock lines can be adequate for well over 300 engine hp if everything is in good shape. Top Hp will dictate the max amount of fuel the pump needs to flow. Line size will make its job easier or harder. Of course at some flow rate, the 5/16 line will simply be inadequate with mechanical diaphram pump. All the details and calcs on the webpage linked above.