Ok, I may just be the most fortunate Cobra replica owner in Massachusetts.
Bought my ERA 427 street version back in 2013 in Illinois. It was already titled an registered as a 1966 Shelby Cobra. Went to the registry here in Massachusetts and simply transferred it as is. No problem.
It gets better. I had a 1966 year of manufacture license plate in which the number was clear (not in use) which I was able to put on the car because it's registered as a 1966.
Yearly inspection? No problem. Pull it in the bay turn on lights/high beams, directionals, honk the horn and basically that's it!!
I am truly blessed