I have lived in the east coat of USA, from there the locals liked Florida cars as there is no ice or snow and many are only used locally so you find really nice clean low mileage cars, a classic is great but spares support etc can be an issue, personally I would look for a Florida Cadillac Eldorado, these ceased production in 2001 but were based on the Seville (I had a 2002 seville) and many in Florida were made into drop tops, comfortable, fast, reliable, loads of support, not pricey, but of course it's your trip, just an option.
Ebay motors is a good place to look anyway and ticket rules are good in US, I am sure any dealer would be genuinely pleased to help.
Another cunning option is to go to emog and ask Dennis Glavis if he can help, seems a very keen Morganeer may sell and buy back a car as well as sort the details, he is the west coast dealer of course.
Just remember, the earth is flat, there is nothing of interest 12 miles beyond the shore and USA is the greatest country on earth and they'll smile at you and you'll have a great trip, oh and say you think Canada is too boring to bother with.
Chris 444 green with jealousy, connaught green 4 seater jealous!.
