"...In other words, $2,500 in 1970 is equivalent in purchasing power to about $16,557.60 in 2020..."
30 grand for a new or rebuilt performance car is very reasonable (not that I can afford that!)
I suspect as the Mopar B and E market has heated up to a point where the average joe is priced out, the A bodies are starting to look pretty good.
More demand and less supply equals higher dollars.
Also most of us remember when gas cost $0.25 per gallon and a house cost $65,000 for a nice one. THINGS HAVE CHANGED!