in fact, here's one that does have some valuable parts in it that you could likely get for close to $1500, right here on this board:
http://forums.pelicanparts.com/porsche-928-technical-forum/946345-1978-porsche-928-sale.html.
The above car sounds like it has the entire drive train intact. If you are looking for a project, the above car would be a good starting point and candidate for a save. Pasha interior is quite valuable on the early cars.