I restored a 1972 Yamaha 350. Well not to OEM, but more as a "Gentlemans Express"; lower bars, Italian surgical rubber grips, bar end nirrors, Donlop TT 100 tires, and a K&N filter.
It was a sale made at a destination stye shop; Cafe Racer Ypsi in old Depot Town in Ypsilanti MI. They are always looking for historic sport machines for their showroom. They are a Biker Coffee House and gallery for unique retro helmets, hand made jewelry, unique signage and some of the baddest Tee shirts you ever saw (black only), and a full Restoration/Race shop in the rear. (I did the resto myself though).
Their website is:
www.caferacerypsi.com I got a ton of cash and ideas for another Valk, but garage space is still limited.