Nicolas bon jour!
well nice to have you. These cars are top notch but lots of work to make them perfect.
First is HOW GOOD is the chassis, as body work is terrible expensive unless you do it yourself as René does. Some metall sheets you can get in the EU/UK..rest is import from the US or custom. You might send some fotos from below..Front, rails, doors, rockers etc. ROST??
Chrome componets are hard to find, so start lookig as you do for the bumpers.
Completeness is next....Rims is the easiest if you go for replicats. If original, tough effort....but can be found at least the 7/8 inch Stuff at reasonable cost. Well 15 vs 17" is a consideration but lost of originality. tires ok for 17 hard for 15 (Avon UK for rear if you want to go big).
Gear box is hard too, did you drive the car, did it shift decently?? .. so RBT is the place in the US..he has a fact/$ sheet. Think they produce in the US/TX, so less issue with supply chain today. Engine parts is getting more difficult as lots of raw stuff comes from far east, well is finished in the US..expect 2 month delivery latency now.
If I can help happy to do as I did all the overhaul. The team is great they know most of the places to look for parts top team members having parts but also Fiat/Ford/Triumpf/ xx/yy and advise..
p.s.. my ORIGINAL motor is 4109 with chassi 4907,car was buit in 12/1972 with cobra JET with open chamber (The "dot"4 per René). did replace them by aluminium heads 
Matthias /Stuttgart Germany