HOW MANY HORSEPOWER???
You need just over 1/2 pound of fuel per horsepower per hour.
500 horsepower X 0.6 pounds of fuel = 300 pounds of fuel
Gasoline weighs about 6 pounds per gallon
300 pounds per hour / 6 pounds in a gallon = 50 gallons of fuel per hour.
You need that 50 gallons (actually, 50 gallons is generous if the engine is properly jetted and tuned properly) at the carb; and delivered at the appropriate pressure.
If you're running a return style regulator, you need to add all the returned fuel to the 50 gallons actually burned.
First Guess: 1/2" tubing is so overly huge as to be comical for 90+ % of street-driven cars.
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