I am feeling old with this thread and I had a discussion the other day about these cars with a local mopar guy. When I got my driver's license at age 18 (yes, I got a late start) in 2004 these 73 and up cars seemed to everywhere. I started with B and E bodies and it seemed like even those were around. When I bought my first duster in 06, I remember you could look in the newspaper classifieds and actually have a selection of 73 and up cars and they were relatively inexpensive.
I bought a 74 yellow duster for 1500. Bucks. It was originally a slant car but I bought it with a mean 360 that was already in it and nice. It was overall a really nice car then.
Now In 2021, you never see them in the classifieds or even on Craigslist anymore, at least not around here. The ones that do pop up seem to be really rough, half in the toilet kind of car or a super high priced so called show car for tens of thousands of dollars.
What happened to the Joe dirt cars that were complete and ran and priced very reasonable. Days gone by, I guess.