Beware on the pumper carbs. A reason to bump up the carb would be because the factory carb won't supply the engine with enough fuel. For an intake and exhaust mods, the stock carb has been sufficient for me. I've seen a lot of cases where people put on the bigger carb only to realize that now they are over-feeding it. Once the big bore kit and port and polished head goes on, this may be a different story though.
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