There are many many many factors that determine the worth of a car, not to mention the need for a buyer. There are 2 sites that will give you general ballpark numbers but I wouldn't use them for classic cars.
www.kbb.com/
www.nada.com/
If you are not knowledgeable on evaluating the "worth/value" of classics, find someone who is to help you. We have seen cars worth $10,000 advertised for $50,000 hoping someone with more money than brains wants the car.
Bill
[This message has been edited by Bill T SS70 (edited 10-18-99).]