I have an 81' 635CSi euro. It is almost completely original, with the exception of some 16" Borbet rims. The car beats most stuff on the road, outhandles most stuff on the road, and looks better than most stuff on the road. I dont have any rust so I dont know about that, but the car is great. Beware of maintenance costs though, they like to break and they are expensive to fix. There are not many aftermarket parts made for it either.