When we are dealing with almost 50 year old cars, value is all determined by what someone is willing to part with for a car, and what a owner would accept to give one up for. Tastes vary and it's a very mercurial and murky state. I think one thing that holds a lot of #3 and #4 condition Mopar prices down (except for some of the really rare ones) is the lack of reproduction parts market equal to those that exists for especially GM, but also Ford. A #3 or #4 GM intermediate or ponycar can be brought back to perfect, showroom condition with a catalog and checkbook. Not so true with Mopars. When I bought my 67 GTX about 15 years ago I couldn't find anything for it hardly. What work I've done on it is about 50% sending stuff out for high dollar cosmetic restoration and 50% scouring every salvage yard within 100 miles of here for good used parts, stainless, glass, parts, etc. I think 67s are still the worse for this - but I have a friend restoring an original 69 Hemi Roadrunner that he bought completely disassembled (and missing many pieces) and he's having a real hard time finding everything he needs to reassemble it now.