The lugs are Bocama, and look like some variant of the Model 18 but with Type II sockets for the top and down tubes. The French LOVED the Huret Allvit derailleur ensemble, and I am told that if they aren't bent and are properly lubricated they work very well. The French (and some Swiss builders) LOVED using shims, and in a way, it makes sense. You're much less likely to have a frozen seatpost! I've had numerous French bikes with shims, and have seen them on several Allegros.
This looks like a fun project, and rivals my rustbucket '89 LeTour that I need to get back to work on ....