Very cool bike; great find. Love it all except that goofy seat cover
That panto/drillium thing going on with the brake levers is pretty sweet and period-perfect. I'm a total sucker for anything with chromed lugs, too. If the tires hold air ok, I'd say go ahead and ride it, but carefully. If the rubber and sidewalls are significantly dried out, they're just waiting to fail. If they're just plain old, they probably still won't want full pressure. Lots of threads on how to do tubulars here, just google around and you'll find all you need. But don't do any fast descending on it until you know you can trust your tires to survive.
It's always a good idea to take those "as found" shots, if you like "dirty bike porn" check out my
Grandis thread. I keep the bike pretty clean now, so it's nice to remember what it looked like when I first got it.
Be sure to post more on yours when you get it all shiny.