Should you buy, sell, or hold these classic Mopars?

1. It's your money or car.
2. It's a free market.
3. If I had a pile of cash to throw around, I'd put it in the market (specifically American business that do not do business in China and definitely not in tech), it is liquid there, not so in a car.
4. Wherever you put your money, it is a GAMBLE, it is up to you to mitigate the risks and maximize return.

If you are in the hobby, you are losing money. PERIOD. It is not an investment. Rather, it is something you do for the pleasure of it, or to make memories with your kid.