Very cool bike. It would have come with down-tube shifters, not bar-ends, and the brake levers were drilled Campy Nuovo Record. The outer ring was heavily drilled as well. The one I had even had holes factory drilled in the crank arms. Nice you still have the yellow label Fiamme rims.

Don't worry about the value. Just put it back together right and enjoy it. Italvega's get no love from most collectors, but the Superlight is a super sexy model. And yours looks like a good size.

Here's pic of what the stock big ring looked like. You can have a good machine shop make you one (don't drill the arms though!)