I don’t really see where you can compare g bodies and AMCs. Not even in the same league IMO. When someone mentions AMC, I think of pacers, gremlins, spirits, and hornets. Nothing remotely close to a g body. The buyers or collectors of either groups of these cars probably don’t even have anything in common. There may be a few rare occasions, but for the most part, not the same.
The op is a wheeler dealer. He buys and sells cars. Does he collect? If a car won’t make money, why would a flipper buy it? They don’t. People who collect cars have a reason why they do what they do. Either sentimental reasons, desire, or to invest their money. These things are all determined by looks, performance, options, colors, and quality. I have read that AMC’s are becoming collectible and people are buying them. Again this is my opinion, AMC’s have none of these things I mentioned except colors.
No one knows how the market will go. Who would have guessed AMC’s would be desirable? G body cars have come around in value but not even close to muscle car era cars. Those cars bring money because they are muscle car era cars. That came and went. That era is over. A new horsepower war is on with the auto manufacturers but not muscle car era.
The value of the 442 he is referring to is a buyers choice. It is an ugly car. One only a mother could love or someone who likes different. It was never popular either. History determines value as well.
Last time I say this. It’s just my opinion. Find a different car to flip.