That’s a great blank canvas to start with. I first determine if I want downtube shifters or STI (integrated with brake levers). For me this is a matter of whether I’ll use the bike more for solo riding or if I plan to use on lively club rides (STI).

You have two great suggestions in the posts above. Dura Ace 7400 8spd STI would be an awesome setup. 7spd downtube would be good dressed in Dura Ace or Suntour Superbe.

Enjoy the hunt and report out on the finished product.