Interesting point... would it be a new car. Need a new VIN. Does it have a VIN? Hmm. Like when you build a totally custom car and need to inspect it to be on the road. You need to apply for a new title and everything from scratch. It varies by state i'm sure. But my buddy did that with a CJ build and he just put 67 on the paper work. Most of it was actually built on a 78 platform but used a 67 tub. No questions really. Titled it as a 67. I guess you never know. Until you know of course! And god help you if you live in CA.
It says they are licenced by GM but that doesn't really mean anything. Still can be a collection of cheap parts.