Electric Fuel Pump Choices???

Do you know the hp of your engine start with that. If you don't plan on making more than buy a pump that will service the hp requirements! You need to buy a pump based on the gal per hour needed .

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?