Is this '71 Dodge Demon for real???

The cars the collector has are both 71 demons with build sheets and fender tags with a m52 code for sunroofs.If anyone wanted to read this they can go look on my ad its posted.I never wanted to bicker over my car, i was just trying to find answers.I updated my ad again tonight as i had the high bidder come over to look at the car, he has been a mechanic for 23+ years for chrysler.We put the car on a lift at my buddys house and louis took out all the seats and carpets and found nothing.He also loked in alot of spots and again found nothing.He did notice the roof had been added on early on in its life, its a factory roof that was added on ?He wanted to buy the car tonight for 10,500 and i told him no due to 2 other guys coming from far away on sunday.I also called both of them and explained to them what louis found with the roof and they are still coming sunday.I plan on letteing the ad go as i updated it with all the info, and dont know much i could say.Again, i am new to the board and have learned alot in the past week and sorry if i pissed anyone off...Never intended to