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Years ago, I used to work with a fellow who would buy one car and restore it to pristine condition and then hang on to it for a while. One day he told me that one of the first rolls in buying an old car like that it's the first be sure that it is something that is going to be worth something when you finally get done working on it. Those old cutlasses were decent reliable transportation in their day. But their day is over. Nowadays, it is an uneconomical gas hog compared to anything else, it's not designed to cruise at 75 mph for an hour and a half like today's modern cars are. It would be a money pit that would not be worth it.
I really liked my1985 Olds Delta 88 Coupe Royale that I owned from 92 to 2001 and that vehicle was garage kept but it turned into a giant Money Pit towards the end. I still hate it to Let It Go, and if the vehicle in question was an 88 Coupe I would have liked to own it but would have passed on it even if financially it wouldn't have done anything for me to spend the money because just having to drive it often enough to keep it alive would be an inconvenience.
In the end it's worth what somebody is willing to pay for it, maybe a nice present to somebody's parents who used to have one years ago, but in reality, it wouldn't be good for much more than getting around town on roads that don't have high speed limits. And again, it would be a money pit.
I have a friend ( husband and one of my cousins) who buys and sells cars. At any given time he owns around 50 cars. He has a friend who works at a scrap yard where they crush old cars. Whenever an old car comes in that is in really good shape this person gives him a call and he can pick it up for scrap value. My friend's problem is that he has too many cars and he doesn't have enough places to keep them. He sometimes calls up relatives when the fellow at the scrap yard has given him a call and it's a nice vehicle but he doesn't want to buy it because he doesn't have a place to put it. It's surprising when I really clean old car goes for a few hundred dollars because that's all it would bring at the scrap yard.