A lot of American classics, particularly resto-mods and super muscle cars are worth considerably more in the US than they are in the UK. You could also run into all kinds of Type Approval problems with hot rods if they are not in original all-steel bodies, and a body alone for a '32 Ford 3 window coupe is $40,000. If buying for Spain I'd be thinking 1950s Jeeps and Jeep variations as well as old pick-up trucks. Spain and Portugal are very unfriendly to big, gas guzzling modern American vehicles and to avoid changing things for UK Type Approval, then changing them back for Spain it would be better to import directly to Spain. New Mustang 5.0V8 GT coupes are from around £35k in the UK. A 2.3 Eco auto convertible might make some sense as a cruiser for Spain, but they are only about £32,500 here. A Hellcat has very limited appeal, which might not last. A fully loaded high power Corvette might make more sense.