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Dual spark plugs will help.
As for increasing swirl, I'm not sure there is too much you can do. I assume your engine only has 2 valves per cylinder. I believe what Honda did on their lean burn engines was close one intake valve before the other, thus making the intake charge swirl a bit more in the cylinder. Really, all you really want is an evenly mixed charge in the combustion chamber. You don't want any areas where the fuel is not dense enough to burn properly.
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