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I have been reading how air gap type manifolds kill your fuel mileage so now I am stuck, I would like better power AND MPG (greedy I know) current engine is a 318-3 2bbl low comp truck motor I also have a 1967 LA318 (factory rated 9.2 comp with closed chamber 273 heads) I was planing on...

going on a stock 2 barrel 273 in a 67 dart with 904 and 600 cfm edelbrock carb both are dual plane small port does anyone know what the difference is? thanks for any help