Hi Jerry,
Welcome to the VCCA's website!
Great back story and current status of the car! I suggest contacting the MI DMV and see if they can help you. They might not because of privacy restrictions.
After that, see if you can find an MI DMV authorized registration business who might forward a letter from you to the current owner without giving you their private info.
Another avenue to check is to contact the Lower Michigan Region (chapter) of the VCCA and see if any of the members know about this vehicle. You'll find their contact info here:
https://vcca.org/page/RegionsGood luck! Dean