Quite good, I'd say. Not even close to the same numbers as in the US, but we have some good and nice cars here. A-/B-/C-/E-Bodys, mainly. M-Bodies are rather rare. I know of only four LeBarons, there are some Cordobas & Aspens, Magnums are very rare (love that car!)... M's are not typically sought after. I think we just don't have the same close history to owing those cars.
So, it mainly concentrates on the "real muscles" - like promoted in movies (2nd gen Chargers always in demand, Challenger/Cudas, of course). Earlies have a strong fan base, but its a rather "closed group", as their design is prompting the question of "what did they take at that time??".
But, sad as it is, the market is currently rather down, fewer sales transactions. People holding onto their money - uncertain times all over. And as local (european) policy is more like "go by train, bicycle, foot" anti-car (somehow pro-electric...

), it doesn't help for the next gen of gearheads. I know a couple promising young people, but it's not the same than 20/30yrs ago.
Then comes infrastructure - after WW2 (in the 50s of last century) some cities promoted bigger streets which helped growth for over 60 years or so, but now some very loud and influential people want to protect the common field mice (common vole) and putting work places / growth on the line (even pushing them down the drain)... Building a new highway is usually a 30 year project.... Together with most cities with roots in the medieval age (e.g. very tight streets) - you get the idea.
So all that doesn't help a lot. Sweden for example has a much stronger cultural approval of US cars (many many have been imported in the 50s to 70s) and much more young people have a family bond to the cars of their parents. Their meets (they have many in the summer) easily get more than 1.000 cars (mostly full sizes GM/Ford - but they have some specialty collectors with 6-figure Mopars). Big Power Meet in Västeras was one meet until 2016 (for 40 years at that time) with like 40.000 cars for the weekend.
Anyway. I won't complain too much, I like my cars, enjoy driving all of them, have a close community of like friends. Even doing trips to Sweden (one way 600 miles) or England (almost same; England though is a sadder story on US cars than Germany, money's real tight for most people there).
There's even a -very small- community of drag racing. But strips are extremely rare, only few events/test'n'tunes.
I was so amazed driving by Brendenton Motorpark near Tampa in the middle of the week in Jan this year, just to learn a couple professional teams had rented the strip for their test'n'tune. Cool.
Unthinkable here - also think people complaing "that's to loud, not climate friendly, blablabla" - local government/officialdom is quite fast closing such community efforts down and killing so much community efforts. Few teams, rather money burning, couple of private teams (with limited ressources, of course). "Free" is something completely different here than in the US.
Way too many lemmings running around here