Recently, a nice article appeared in Car and Driver regarding kit and replica cars and the issues we can face in registration here in the USA.
The various states are grouped into three overall categories with Colorado, Connecticut, Hawaii, Illinois, North Dakota and Utah being the most difficult or rigorous states to secure a registration.
If you are buying a used or building a kit car and will be registering the car in your state for the first time, then this article may help you out and at least set your expectations correctly.
If you missed the current issue then you can find the article online at:
http://www.caranddriver.com/article....&page_number=1
Cheers.