Very limited production, and hugely desirable right now. Do you know how much history and how many owners ? Check out John D Glynns blog
Porsche 911 Carrera 3.0 for really good information, and he tells you the significant details you should be checking for. His site is also a yardstick for C3 prices in Europe. I think the white over black with black trim and original tale, gauges sounds fantastic, and is a great combo for these rare & sought after cars.
Its a long shot but please PM me if you pass on the car. I will happily pay a finders fee.