The ones out of Cuba will need a heap of restoring, having been run to death for 60 years.
Most of the good “American classic” cars were expropriated and sold in Europe in the 80s. What remains have mostly been re-engined with Soviet-era engines and other non-standard mods. Given that that’s what kept them going as long as they have, it would almost be a shame to restore them back to their original condition...let them be another subculture of car collecting.
Somehow it wouldn’t surprise me if the old cars are declared “national treasures”, and export of them off of Cuba is forbidden.