That story sounds familiar. I got my 240z for $800. From the outside, the car was clean. So was the inside. The seats are good, the dash has a single crack, the center console is good, etc. I knew the floors were bad, and knew it needed work. However, it needed much more work than I expected once I started taking it apart. To give you an idea, the only good part of the car is the roof. Everything else is bent, improperly repaired, or rusted.
Good luck.