Supposedly, the factory spends a lot of time designing the air box to fit in it's space and provide decent performance from idle to redline. If your stock air box has a removable lid to get at the air filter, taking it off may give you the best performance. If you don't like the CV carbs, you may be able to get non-CV carbs (pre-1979 or so) from ebay. Might even have better jetting.
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