What's a 69 Dodge Dart /6 worth?

Hey guys, there is a guy I work with that has a 69 Dart that I've been trying to get him to sell me. Well, I think I may have beaten him down enough to where he just might. I asked how much he would take for it. He says,"make an offer". I hate it when people do that. I don't know what he might want for it. I don't know if I might go to high or to low. One remark he made was," these Mopar's are rare". I was like,"they are not that rare".
Anyway, It's a 69 Dart with the 225. The engine does have a rod knocking. This is not an issue as I plan on going to a V8 anyway. The front end had been rebuilt. The paint job looks OK but the body is wavy all the way down due to sorry body work. That will have to be redone. The interior is in decent shape. The Dart has Crager SS wheels on it. I have not looked at the floor pans or anything like that. I'm going by the last time I saw the car and what he has told me. He did drive the car to work everyday until a couple of years ago when the rod started knocking. Anywho, how much do you think I should offer him for this sled? I'm sorry, I don't have any pics of it. I know that would make it easier.