Ford Mustang/Shelby 1965-1969, help?
Follow the link below to one site that lists the type of car you have an interest in. The second link is for a "re-creation" at $49,000.
An original could easily be ten times that. In fact, the Barrett Jackson Auction in Las Vegas this past winter sold a GT500 "authorized" recreation for $175,000, with the announcer commenting that an original had recently pulled three quarters of a million!
The car, of course, must be flawless. A beat up original, if you can find one, should be way less, as restoration is a very costly process, even if you do it yourself.
Since parts can not be bought from Auto Zone, maintenance and upkeep will be very costly, as well.
BTW, the current "Shelby" Mustang will smoke these older cars, and cost a lot less. But any ORIGINAL Shelby purchased today and kept in good condition can reasonably be expected to increase in value as time goes by. So, if you are in a position to get one of these cars, and you drive it only occasionally, you can expect to make a profit a few years from now, so the car will be free.
Jay Leno bought a McLaren F1 not so long ago for 800K, and one of them recently pulled over 4M at an auction, so his net cost of ownership is now a negative 3.2M! Better than free! IF, you can round up the buy in, and you get the right car, cost is literally no object!