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What about on an otherwise-stock or nearly stock motor, say like the 400 in my 73 wagon? Other than the cool factor, any gains to be made by swapping the 4bbl for a 6bbl setup?

on my 69 r/t with a stock 4bbl carb and intake vs a stock 6-pak the car went from 14.00's to 13.30's. this an automatic, 3.23 rear, stock exhaust car.