65 promotional car?? test car? HELP

I stopped and looked at a 1964/65 dart sitting on the side of the road today for sale..its rough BUT i take the # and leave a message the old guy calls me back Tells me its a factory test car or something...Its a V-8 a/t 5 lug wheel ready for this part?? Its a FOUR door..it did have some kinda sticker type thing on the dash..so i say well how much?? Thinking to myself maybe i'll give 500 maybe..he tells me that he turned down 15,000..not 1500 BUT 15K now is this someting i should go look at alittle better or does this old dude just need someone to talk to..???