I've got an early to mid-80s Gitane I've never been able to nail down. Currently running truvative 9sp cranks, with french thread Phil BB in the back and a standard sram in the front, I had to turn down an english thread eccentric to do that but 20.00 vs 200 made it an easy decision. Shifting is Dura Ace bar ends running friction. And riding on Velocity tandem wheels.
My wife has been wanting to get more serious about gravel riding and doing some longer rides on it so it'll be undergoing some revisions again this year.
Plan are...
ditch the V-brakes for much nicer cantis, even with the travel agent the brakes suck
New seatposts, the old ones are really light weight and I suspect weak. I think they're 25.0 but they were so chewed up when I got it I could never get a good reading on them.
Sand down a threadless adapter so I can run a stronger handlebar with a threadless stem.
Ditch the simplex for a tiagra triple front and a deore rear der to run a wider range cassette.
We've already run it with some 700x40 tires, so I know we can go gravel with plenty of clearance, neither of us are real powerhouses so I suspect it'll be a very comfy ride that won't be too whippey with out power levels.