It's lugged steel, isn't it? Nothing really better for touring.
How does it ride right now?
I'd say new hand built wheels would be a good start, but keep the rest of the drivetrain if it's in good shape. Friction works fine. So new wheels, new cables, repack and check the headset, a good set of panniers if you don't already have them. And the most important thing.......
.....the cash to enjoy Europe! Don't spend too much money on the bike, because touring isn't really about bikes. It's about your good time. Get the Univega upgraded/tuned enough to make the trip with breaking down and stay away from fancy, silly, cash draining upgrades. Spend your money enjoying the trip of a lifetime
Most of the real hardcore tour riders I personally know have crappy old MTBs. They spend most of their time/money on the ride, not the bike!