LOL!
You seem have forgotten all these cars are of one make; Ford. The highest performing Fords. Yeah, if you are lucky, you will attract 3-4% of that 100,000 pool of modern performance Ford owners because you are correct, most of them don't care about 50 y/o cars.
You're absolutely right, you have very little to offer them...except heritage. The real point is what they have to offer to you. Namely youthful eagerness to get involved & learn about the history and the cars.
That is more likely to keep them on the road rather than being investment tools.
In closing; Get off my lawn!