Electric Fuel Pump Choices???

I guess 500+ HP, I have a purple shaft cam out of a friend's car but have no stats on it. Can you buy to big a pump and then use a regulator to control the fuel to the carb?

What heads? Planing for a 500hp fuel system is ok, won't hurt a thing but making 500hp in a big block mopar isn't as easy as the internet boards say it is.