on a fairly well built BB street car or any street car with a carb for that matter, why would you want a pump that delivers over 8psi when you can get the same GPH at less?

you wouldnt
over 8 psi will usually push past the needle in the seats

You don't need a high dollar pump even for a moderate built big block. I run a Holley blue pump with a regulator to turn down the pressure to 7 psi . 505 stroker pump gas engine.

And an Edelbrock or similar carb wants regulated to 5 psi or less to avoid overpowering the float/valve.

absolutely to every point made! and how much GPH do you really need, 72, 100, 110? realistically I would think 72 is more than enough even with a 6pac or 2 4's?

1/2 pound of fuel per hour per horsepower.

thanks guys! I translate all the responses to say i'm good with my Carter 72 GPH 6psi in my 12 second Road Runner!

If you have overkill on your fuel delivery system you may want to think about a bypass regulator, that'll return the excess fuel supply back tot eh tank. This will keep thew pump from deadheading and heating up the fuel, it's also ensure that you have enough if you need it and the fuel will generally stay cooler by running back to the tank rather than heating up under the hood.

nope, not having any issues with what I have except it's over 20 years old and the pressure is starting to get a little 'bouncy' and I've had to make an 'impact adjustment' a couple of time to get it going. probably time to replace it so I was looking at what is available and need to make sure that what I had was what I needed.