You need import documents. Not a big problem for a pre smog car but anything that needs an epa sticker it gets difficult. Time limits and bonds to get it up to US standards. Not done in time won't pass emissions/safety regs they come take your car and crush it.If you think getting title to an out-of-state car is difficult, I cannot imagine what would happen if I showed up at DMV and said "I have this old car from Cuba that I'd like to register..."
Not as easy as you think for out of country cars. I had a Ford Festiva that was the prototype ShoGun. The car was a total bought out of a CA junkyard. It was rebuilt and retitled in CA. Since it had a SHO Taurus engine in the back seat it needed to go to the CA Air Resources Board to get their approval and sticker. The car got sold to a Ford dealer in Canada who also had a home in CT. He retitled it in Canada even though it stayed at his home in CT. One of the original builders bought it back. Since it never left there were no documents proving it was in the US legally. I ended up with it and had zero luck proving to CA DMV that it was a US legal car even showing them the original arrival paperwork from the Port Hueneme docks, Sale from CA junkyard, old CA registration card, orig ARB papers and a statement from the Canadian owner it had never left US. Their advise was to drive it into Mexico and do the paperwork when I crossed back into the US. I sold it to the other original builder and he had no trouble getting a GA title and registration. He sold it to a guy in Germany. Article after I sold it - https://grassrootsmotorsports.com/articles/sho-time-original-festiva-shogun/Jay jay, Cali is an easy title state. dont get your feathers ruffled...........
Guys, the car is in Tacoma, Washington. In the U.S. I doubt that car has been anywhere close to Cuba.