This is the old form - new form is here - https://www.showordisplay.com/2021/03/application-for-permission-to-import.html
If you can't see the document below - Click here.
A rule permitting entry of nonconforming motor vehicles for purposes of show or display became effective on August 13, 1999. If you wish to import a vehicle for show or display, you must apply to NHTSA for permission to do so and establish that the vehicle is of such historical or technological significance, and that it is in the public interest to show or display the vehicle in the United States.