Sweet score! I usually recable a bike and put new tires on... my partner experienced a vintage tire blowout (thankfully while we were stopped) and I don't think I will ever use "vintage" tires on a bike again.
For 27" tires I think the nicest riding one would be the
black sand canyon tire and it seems like a heck of a deal at that price. If I were stateside I'd buy 3 to have a spare on hand. The only thing to check would be to make sure you have enough clearance if you wanna run fenders at some point, these tires are 1/8" wider than most 27"