NADA says $5,000 to $13,500 depending on condition. Of course, given the current economy it's value is a lot lower than it could be in good times. It is definitely worth 500. Just a cheap top will cost 2/3rds of that. Buy it and keep it. It's cool!
Buy it and keep it. For that money you can't go wrong. It' getting more and more rare too. Better then money in the bank. Go and get it and send us some pictures.