My fiancee's father has an M3 of the same vintage as the 328 you're pondering. If you want, I can get photos taken of the interior for you. Another good source for what options might have appeared on any given old car is cars.yahoo.com's used car guide. I don't see anything particularly illuminating about the car you're considering, though.

However, that car has essentially the same powertrain and suspension as my own car. I've had problems. Lots of them. Run away while you still can.