In our neighborhood, the car is at a give away price, and it would have to have serious structural rust to be overpriced. Have you done any homework on the actual selling price of restored fgf verts? The real selling price for top-notch cars is in the low to mid 20's--more if a seller is willing to make'em sweat.
If I were in the market for the car, had the money/storage for the car, and the car was in a condition above a basket-case, you wouldn't have to worry about debating the purchase because there wouldn't be anything to discuss other than whether or not the oil spot on the pavment came from the bird or another car.
As far as the 455 in the car: Just like Jim said, unless the person is a real sfb, you shouldn't have any problem with the 455 and tearing up the car.
