I had a '69 Dart 2dr. HT that I owned since new. It was a 318 4-speed car, with Rallye suspension, frt. discs, 8-3/4" axle, fast manual steering, and their White Hat special appearance group. It still ran like new with 101K miles on it, and had been garaged since it was 4 years old. I sold it in 2007 for $10,000 to one of my customers at my rental store. It was almost all original in #2 to #3 condition, with all maintenance records since new. Prior to that, I had a '66 Ford Galaxie 7-Litre convertible with the optional 425HP 427 engine with a 4-speed transmission. That was a real sleeper, no one knew what it was unless they were sharp enough to pick up the sound of the solid-lifter cam. Ford's of that era were not known as performance cars. At the same time, my father had a first year ('68) Hurst/Olds, one of 18 with factory air out of a run of just over 500.
Unfortunately, these cars weren't considered collectible back then, as you could always buy another next year. In the '70's and '80's, no one wanted them due to insurance costs and their appetite for high-test gas, and sometimes lots of it. I think they would both be big $ cars today, as they were rare when new.