Prowler orange- It's your money and time. It will probably be several years [ I'm guessing 15-20] before prices start dropping on the E-bodies . It's an age related thing. Once all the guys on this board are 60 and 80 yrs old, they'll quit buying old musclecars. It'll be like 57 Chevys or Model A fords, at some point the nostalgia kicks in and people find they can afford them so they buy them 30+ years after they were built. I doubt 57 Chevs are rising very much anymore pricewise , and Model A fords - well probably dropping $$ when you factor in inflation. A guy born in 1960, 1970, or 1980 just doesn't want a Ford from 1915. And soon, guys born in 1990 or 2000 won't want a 1970 vehicle. OK, maybe they want them but they won't buy them. I want all sorts of cars , but realistically I can only afford a few.
Really, you'll only see the appreciation of the Challenger $$ once you Sell it. But Until Then You'll Be Putting Money Into It...
Take some good pictures of it, so you can look back at them, and I say write down the VIN# or save a registration slip, so if in 20 years you want to find your old car, it'll be a lot easier to find, than saying " I'm looking for a 197X Challenger ,used to be [ insert color], anyone seen it ? "
I sold my 'Cuda and it's been gone about 2 months. I miss the hell out of it, but I made a conscious decision to put the money towards something I felt I would enjoy more.
Like some folks said, there will always be a car show somewhere close by if you need to touch an E-bods sleek metal flanks.
Good luck and let us see that Prowler once it is in your driveway !