As a new member not only to this forum but to the '75-'79 B-body club I will share my thoughts. I have owned an old Mopar of some kind since I started driving back in '84. I was and still am a long time C-body owner. I sold my '65 Monaco 383 car this past summer after 25 years of ownership. I decided that as much as I liked the car I finally wanted something different. My goal was to spend the proceeds off the Monaco on the next car,preferably less,but not more. It took many months of searching to find the car I wound up with. Pics are in the Garage. When my search began I was seeking an all original low mileage car as I tend to appreciate them more and more. Anyone,especially with a large enough wallet,can restore a car, but as the saying goes,they are original once. Besides the criteria I started with, I was lucky enough to find an original family owned car from day one,basically loaded to the gills,and my favorite color x3. I don't feel I overpaid for the car but I wish that I could have gotten it for less(as most of us do!). And seeing some of the outrageous asking prices for these styles(Cordoda,Charger,Magnum,Sport Fury,etc.)I think I bought very well.
As for value, I believe the more heavily optioned cars(especially T-tops)will command more of a price. My two favorite muscle cars are a '68 Charger and a '70-'71 Cuda. For what I paid for my Cordoba I would be lucky to get an engine block surrounded by 4 wheels sitting on a pile of rust for the cars I like. Although my car is not 100% perfect(what 40 year old car is)I can hop in it,hit the key,and DRIVE! In conclusion, I feel that although the prices on these cars will not skyrocket, I think there will be a slow and steady rise. The average hobbyist is priced out of the muscle car market, therefore if they want to participate in the old car hobby, they will have to set their sights on a more affordable car.