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IMO, a double pumper is a great way to waste gas on a street car.





That's because you don't know how to tune it...lol
any 4bbl carb will be a waste if you foot is heavy. and why would you have a 440 and care about mpg's? FWIW I managed to get 13mpg hwy in a 67 coronet (440) w/ 3.91's doing 70.