Most of us buy these cars using the highly tuned skills of gut instinct. And many, like me, are not ever going to sell until our bodies are starting to rot six feet under, so a return on the 'investment' is not a subject of interest.
You won't lose money on any car - yea, right. In reality, after purchase you will most likely be afflicted with the upgrade disease. The nicer you make the car, the more difficult it will be to justify - financially - all you put into it. Sort of like fixing up your home while the neighborhood around you turns into crack houses. Sure you have a great house, and it will command top dollar, but not a reasonable "return".
If you want an investment, buy a hemi Cuda'. If you want to fulfill that 19 year old dream, and have more fun with a car and people than with any other car, go out and find your Pantera, the one that 'talks' to you, and buy it just because it feels right - not because your broker would approve.
Larry