Keith, great wheels! check out the various Challenge tubulars on Ebay - some nice recent product out there for good prices.

I don't think there's much risk inherent in like-new vintage tubulars. If they hold air, the sidewalls look intact, and the tread is stuck on well and not ready to disintegrate, they are ready for the road. There's no magic in them, just structure, rubber, good thread, and adhesives.

I would not be afraid to ride them around town, watching out for the glass patches.