Thanks for the info and the photo reference.

Yes, I am hoping to run 700...hope it works out! I've found one Universal centrepull so far, and I have a couple of Peugeot branded centrepulls for the back if nothing else turns up. Haven't settled on cranks yet; it would be nice to have old cottered ones if I can find some.

My next puzzle is the finish: the frame is full of "character"; foil decals, a local bike license sticker, that sort of thing, so I don't want to re-paint. However, the top tube is pretty worn, and now that I've cleaned off the surface rust about half of it is close to bare metal. (I only used rust remover and a plastic pad, with a tiny bit of steel wool when there was rust with no paint nearby.) For most of the frame, I think I could just clearcoat and wax, but I'm not sure about the bare areas of the top tube. Even if I "matched" the colour it would look odd with the distressed finish on the rest of the bike. I may just clear coat and wax for now. I'm also thinking about using this "rust inhibitor":
RustOleum.com
You apply it "every six months" for outdoor items, and I can be removed with mineral spirits, so it could be just the thing for now.