I bought a beautiful 1991 miyata 600 grand touring bike about a year ago and converted it to fixed gear for commuting. I recently decided to convert it back to a touring bike because I like it too much to ruin it in the rain and I would like to tour my state in the summer. However, the components that came with the bike were not so beautiful and I need to replace almost everything. So far, I have gotten a shimano 600 triple crank, and a 105 front derailure. I need help replacing the rest, so please share any ideas you have. I like the idea of using parts from around the same time period. Here are some specific questions I have:

1. I bought some campy friction bar-end shifters but they don't fit in my handlebars! Should I buy new bars or just stick with the index suntour barcons that came with the bike? Naming no names, I have been advised not to use index shifters on long trips because of reliability issues.

2. Is there an ideal tire size for 700c wheels and a medium laden bike? I have canti bosses so I can run bigger tires, but I'm not sure what size/brand to get. Any help much appreciated!