I've got a 1984 Trek 620..

I never used it for a fully loaded tour, but have used it for some supported touring. It came to me with some changes from stock, and I made a few more of my own. It handles 50-38-28 in front, 11-34 8 speed rear quite well. (You'll need to stretch the rear from 120mm to 126 mm spacing -- or just be very strong when you put the new wheel on!) I added a 2nd water bottle mount fairly early on.

As for how it handled, you can see a trip report from the Bon Ton Roulet at http://www.bikeforums.net/showthread...om-the-Bon-Ton