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First, it's NOT stock, since you don't have the stock carb. Second, you didn't tell us the year or model. If this is a mid-80 305 that originally had the computer controlled Q-jet, a LOT needs to be done to convert to non-computer operation with good mileage. Third, if this is in a heavy vehicle, you won't get much better mileage with any engine. Give us a little more info to work with.
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