Hi Jay. Bit difficult to guess vales right now as these are crazy times,, shops don't have new ones and second hand ones are fetching a premium if in good order and ready to go.
You also need to check the head bearings by holding the front brake on and pushing to a fro, any more than a little play could mean new bearings. Similarly with the BB wiggle the cranks to feel for wear. I'd change out all the cables, inner and outer and check the blocks. Do the wheels run true, any loose spokes? Any noise or wobble in the hubs?
Can't see the pedals properly. Could you post a better pic of them? They look like they could be Shimano which should have toe clips attached like this or are they clip in type? In fact scrub that as I think they are Look clip ins, so need to be changed.
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Can't help you on the model I'm afraid. Try checking the online Peugeot catalogues for that era.
Good luck.