Easiest electronic ignition upgrade?

You should be able to get a "rebuilt" at any parts store. If this is any sort of performance engine, you might want to or have it recurved. This however, is likely true of the one you have now, or any other you'd buy

Good point! I had to recurve mine with the welding the slots up method so if that is something you don't have access to, it might be best to buy a distributor that has a more easily adjustable advance curve.