Question about replacing pedals
I recently acquired an '83 Motobecane Mirage Sport in pretty nice condition. I think it'll make a good daily driver. It has all original equipment. I'm not too crazy about the pedals, which seem to me nothing special (according to the catalog, they're Maillard RA500). Besides, they're showing signs of stress fractures along the outer edge of the cages, and I'd like to replace them with something period-appropriate before I have any problems.
I'm a newbie at this sort of thing, so I'm wondering, how can I tell what kind of threads these pedals have? Is it safe to assume they're French-threaded? The cranks are Nervar 3020. I've done some searching online and in the forums, but it seems like in this era Motobecane was all over the map in terms of the kind of threading they were using.
Any help will be greatly appreciated!