Delaware is really flat right? if so i dont see why not. Solex's only go like 18mph though; no performance parts available. looks like they are still in production (stevesmoped.com sells them, might be clones) and 1977mopeds, Treatland, and Stevesmoped sell parts.
if not a solex, i would do Puch, Tomos, Motobecane, Or any other brand where there's plenty of documentation and parts available online. Whatever you buy; keep it stock at first. I would suggest holding off on "performance upgrades" until you can keep it running perfecto for a long time. the 2-stroke learning curve is very steep at first, lots of reading required.