I think Steingar's was an early '80s, but I wouldn't trade for either one at that price. For the way it sounds, if you really wanted the wing project, I might offer him $1600 + his bike for yours. Looking at the following listing, I might not even take that deal.
Since the 426 is converted for dual sport and has a motorcycle title, I'm sure you won't have a hard time selling it. A guy I work with just turned a profit after he rode a WR250 for the season because the buyer came from out of state to get a bike already titled as a motorcycle and payed the asking price. the only thing I see that is a turn off is the stator issue. I'd be holding out for a better offer.
And why didn't you post it in the general flea market, as well as in central. I heard there is a guy with a civic and a trailer that makes out of state deliveries so it could be really convenient for you.