[Lynn]

I would not try to factor in future value. A car is not an investment 99% of the time.

Yeah, everyone can point to a few cars that really paid off over time. Most did not. Even a ZL1 purchased new in 1969 for $10k would struggle to keep up with investments.

Future value is a crap shoot.
I remember guys paying double sticker price for 1976 Cadillac Eldo Convertibles, because there were supposedly the "last American Convertible."

That would be a bit over $22k. If you put that $22k into the a conservative investment, such as a Dow index fund, by 2020 it would be about $605k. Think you can get that for your 76 Eldo?

Also, if you are going to look at the "real" cost of your investment, you must deduct every dime you spend on it. Insurance, repairs, maintenance.

So back to the ZL1. $10k invested in a Dow index fund would today be about $764k.
The ZL1 is looking pretty good... until you factor in the cost of keeping it (garage space isn't free) the cost of operating it, and maintaining it, and the cost to insure it for all those years. Not looking so good now.