If you are running a draw through design, DO NOT use a plenum. Not if, but when the engine backfires, you will blow up a perfectly good motorcycle, and probably a fair part of yourself. Since you've already found that a turbo won't work so well anyway, focus your research on supercharging. But, again, no plenum with draw through. Since the s/c would run off the crank or clutch, no plenum would be needed anyway.
There are four main types of superchargers. Twin rotor, twin screw, eccentric vane, and centrifugal. All have their strengths and weaknesses. The aisin AMR300 or AMR500 are small size twin rotors that could work well. The Eaton M24 is too. From what I can tell, the Judson type eccentric vane would probably be best for this application, but good luck finding one.
You could go blow through to eliminate puddling, but then you'd have to pressurize the float bowl and get real creative with jetting as the carb reacts to velocity not density.
If you do go draw through, make friends with Lancer so he can give you advise on carb tuning.
Whatever you decide, keep us posted. (Me primarily, as I intend to do a supercharger myself) Just be careful, and remember that if you do blow yourself up, we could all use the advice on what not to do!
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