That garage owner has barrett jackson syndrome..........your car will never be a high dollar car worth a kings ransom. When I see guys trying to flip these old chryslers for more than 20,000 I cringe. there are many well finished ones of the same era out there for 12,000 and less.....some even have new tires and shiny paint....lol.
If my dodge was a pristine low milage original it wouldn't fetch more than 10 or 12 tops because these cars haven't caught on with the in crowd yet and real mopar guys are too cheap and smart to pay 45 for a 10 thousand dollar car.
If your pain is too severe sell this one and buy a finished one....there is no shame in admitting your wrenching days are limited. You will find a nice car and save 150,000 in the process. Good luck !