What to pay for this 71 Dodge Demon

Ok guys I have been looking at demons here there everywhere. Trying to find one in decent shape but still have the options that I want. Was really looking for Bucket Seats, 4 Speed. Now I have found this one, but not sure what to offer on it. The Gentleman wants 10K, but I'm not sure that it's that clean. What do you guys think?? Also it has a Duster Tail Light panel in it because the car was rearended before. Looks like somebody has put some mud in it and maybe it's popping out?? I just would like to get some opinions of what you guys think? It's an original 340 car, but was an automatic and they have changed it over to a 4 speed. Motor has been redone and has around 6,000 miles on it.