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I have an early model die cast carb from 1966 - clean it every few yrs but only rebuilt once about 20yrs ago. I would check for little water accumulating at bottom of the tank. As your cruising around it sloshes & mixes with the gas and may give you an rpm drop or some hesitancy. Pump out a couple of gallons from the tank bottom in a jug and see what you have,
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