With what it sounds like you currently have (6v, negative ground, with an external coil to the points in a magneto), it will run fine. You'll have to mind the points as John or Jim pointed out, as the condenser in the mag is possibly rated differently than the one for battery ignition. (That may also be what's making it hard to start right now.)
As far as converting to 12v and battery ignition, at least from the economics of it, you'd have the cost of a good used distributor and an alternator, and a few odd parts (bracket and pulley for the alternator . . .)and a battery. If you think you might want to put it back to original at some point, for the same money or less you could put it back to original next week. I see rebuilt H4 mags going for $150-$220. With that and a good set of heavy battery cables, and a magneto (single-pole) ignition button, you could go back to negative ground, repolarize your generator, and be good to go.
Thats my two cents! Let us know how you're making out with it
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