Greg, you`re right about the 528i in `78, but mid `74 bmw started selling the 530i in the us.
my 520 was never restored, but had a repaint about 10 years ago. It`s in pretty good shape and has about 80000 mls on it . fully documented...
very little rust ,which is pretty rare for these cars.
it handles great for a `72, esp. with the 16" alpina wheels. 205-55 up front and 225-50 in the back.
The 122 cui , 115 hp engine
makes you feel like you`re driving in the opposite direction when you floor it, but I don`t care about that... its real fun to drive and the babes seem to like it too...