Without sounding judgmental . . . the seller is wasting everyone's time. The car didn't (and shouldn't have) sell at $350K and so it's now doubled.
502 built for homologation purposes makes it rare, however these regularly sell for about 100 Euro. So, you could get this car, a BMW E30 Evo III, a Sierra Cosworth and still have money to import them and the first class plane ride to and from Europe.
The text of the sale description is also lame.