Welcome aboard and good to see you here!

The real decision on "originality" is what is it that you want the car to do? Protecting an "investment"? making a show car" or perhaps just a cruiser?

Obviously, saying it is "the original" has a certain "something" and will bring a return if and when you sell it. But, it's a Ford and other than date coding each part, it'll be hard to prove otherwise.