Here is a link on the topic
There is a cutoff at 25 years, older than that there are no import
restrictions on bringing a car into the USA, but there still may be state
licensing restrictions which must be met. Check with your state licenser.
Follow the non-Canadian link and there is a list of Registered Importers. A
quick call to one in your state would likely answer your questions without
trying to interpret the online info.
/// email@example.com mailing list
/// or try http://www.team.net/cgi-bin/majorcool