The beefier Vitus 181 tubing should be ideal for a loaded up tourer like that Gitane.
Canti brakes also makes a lot of sense for that bike. Later Gitane design and graphics is so cool too.
Tell us how it rides once you get it loaded up and trekking!
BTW, a lot of these 80's and later French bikes usually have English threaded BBs.

Chombi