This one is rough, but I have only seen a couple of these in person. But I question the viability of restoring this one, probably a parts doner for a better example. Even though the seller claims to have many extra parts. To bad as they are unique cars. http://www.ebay.com/itm/1975-Buick-Century-/142333103774?_trksid=p2141725.m3641.l6368
That actually doesn't look too bad depending on how much rust the old paint is hiding. Sounds like he has quite a few interior parts too.You'd probably be upside down on any of these if you put a ton of money into them so this would definitely be a car you would want to keep and enjoy.
Phoenix Graphix has the complete decal sets for 400 bucks. Yeah, if it isn't a rustbucket it looks like a pretty easy resto if you don't get carried away. I personally can't stand cars with 5 mph bumpers/locomotive cow catchers. I don't like the huge bumpers on my car but at least they don't stick out like a huge chrome plated sore thumb.
Well, if it isn't original enough to not modify it, just tuck the bumpers. It would look tons better.