Those Mafac levers are not original, those have the uncommon integrated J quick release. They fetch a handsome sum on eBay often.
depending on the other hardware in the brake system, you might wish to keep them for the quick release feature.
many liked the shape of them.
while there is “production” correct, truth was many bikes were modified to suit the owner’s preference.
the front derailleur mechanism- once it has shifted to either ring, it should be able to run with adjusted with no noise, no rubbing of the chain after it is trimmed. The approach is shift with authority, then trim away the noise.
as I was just working on a similar Stronglight chain set, make sure the two front rings are 100% compatible- older chain sets used slightly smaller bolts connection the rings.
later use an Allen key attachment, earlier hex head bolts. They really do not mix.
Last edited by repechage; 11-27-21 at 02:57 PM.