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The port on the back of the carb is for your brake booster if it has power brakes if not plug it up . Older model carbs didn't have the return line going to the carb . Don't know what year that changed though . If your carb doesn't have the extra line to hook up the return line then you might want to plug it or change out your fuel pump . The older fuel pumps 72 and up had two lines goin in and one going to the carb .
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