Regarding DOT / NHTSA, its easy to import a car more than 25 years old: > A motor vehicle that is at least 25 years old can be lawfully > imported into the U.S. without regard to whether it complies with > all applicable FMVSS. www.nhtsa.gov/cars/rules/import/faq%20site/pages/page2.html#Anchor-28852
There's a customs and border protection form too: www.michigan.gov/sos/0,1607,7-127-48268-179823--F,00.html
Those are just things I found when searching on-line. I'd be interested in hearing if someone has been through the process or knows what else might be involved.