I have a similar frame which turned out to (most likely) be a 1975 Champion du Monde, there is a discussion of it here: What "honeycomb" Gitane did I get here?

Mine is built up now, and rides very well. The rear dropout has stops for both Huret derailleurs, and Campy derailleurs, which is nice! I am currently using a Huret Jubilee derailleur with a modern 24T 5 speed freewheel, but ended up mounting the Huret with a campy adapter to space the derailleur out a bit more for better shifting. Seems odd but everything works great. In my thread someone said that dropout will take Simplex derailleurs too--don't know myself and haven't tried, but I noticed the Simplex cable guides on yours.

Nice paint and I think it is a Gitane color, though it seems Gitane usually left their fork crowns chrome.

Great bike and there is no problem finding appropriate decals as I recall!