"The best Dodge made that year" - 1978 was not a banner year for Mopar by any means. $8500. https://kalamazoo.craigslist.org/cto/6188530183.html
Listed in Kentwood MI (where I live). Those pictures were not taken in Kentwood. The MJC Classic Cars front plate makes me wonder too. If somebody wants me to look at this I can.
My guess, considering that front tag and the FL registration, the seller bought the car there, perhaps had second thoughts, and is flipping it...at a price about double the value, IMO. Nice car, but not $8,500 nice. Five, tops. And I'm a Mopar guy from waaaay back.
If he did indeed buy it from MJC Classic Cars then he is taking a loss on this one for sure. I was going to drive by the other day to see if the car was there, but I had other things come up.