US law is extremely lax with classics, unless you live in California (due to their strict emissions controls laws).....here in Kansas you can do anything you want.....whether its Honda swaps or Mini engine changes from a 998 to a 1380....they really don't care.
The Feds do care if you import a car newer than 25 years and try to register it, but to take these parts and put them in a new shell or anther car entirely does not matter to them at all. Anything 92 and older is not problem...newer than that is verbotten!
Edited by Magneto, 29 May 2017 - 03:03 PM.