I once found a 1955 Ford F-350 next to a barn once. I had it taken to my home but I gave it away after a while as I got screwed by our laws.
You cannot register a car that you "find" in my country. It is completely impossible. So, even if you were to buy a barn that was full of abandoned Shelbys, you could only send them to the crusher or sell them in parts.
We need a sales contract from last owner. Last owner means last person the car was registered to.
That means that if someone of you guys were to sell his Mach to a European (let's call him Joe) who brings it over to Europe and sells it to me, I could not get the car registered, unless Joe has it registered in his name before he sells it to me.
Only exception would be a dealership. They can act as intermediates but I would need to show their accreditations as dealers and such.
But other than that, no registration.
Also that thing that you guys call a "clean title" does not exist here and an American one will not be accepted.
Here's a pic of the F-350 next to my Mustang before it was restored (in my old garage that I no longer have).