Or maybe an “R” title as a Reconstructed vehicle. There are surely a bunch of retrofits that will be required to make then street legal, depending on the state they go to.
As in Connecticut, they have a "Dept of Reconstructed vehicles" ( aka kitcars rods etc ) that inspects them so you can get registration.
Depending upon the state(s) I can see some entrepreneur coming up with what maybe needed to get them legal and or spare parts. I'm thinking wiring harnesses for lighting ( if needed ) and whole SBC LS engine kits etc or they do it turn-key...