What's a 69 Dodge Dart /6 worth?

Go on Ebay and print out a few recent sales of /6 -69 Darts. With that you can show him what they`re bringing and show him how "rare" they are. Many people have no idea what the market is doing now. If you make him an offer, low ball it, and when he counters it will give you plenty of room to make concessions. This way you guys can finally come to some figure that you can both live with.