[Tengu]

G'day mdl, the Dept of Infrastructure and Transport are awake to cobra replicas registered as 1965 or 66 cars in some US states and refer to them as an example in their car import fact sheets. My car was registered as a 1966 cobra but in order to gain import approval I had to provide proof of the date of manufacture which they describe as being when the body was joined to the chassis. Ideally if you can obtain registration documents from pre 1989 or any other documents that prove date of manufacture was pre 89 you're on your way. In my case the owner only had rego papers from when he bought it in 1995 which was no help. Fortunately the previous owner had provided him with the original order form and delivery date of the completed cobra, indicating that the car was constructed in 1983.
DIT and customs provide info on the net, and check with Canberra's rego requirements for pre 89 imports to make sure you can get it registered.
Good luck
Mike