I brought in my 72 Fairlady Z from Boston when I returned to Australia last year.
The biggest issue you will have is border control. As well as usual quarantine, Australia has a zero tolerance to importation of items that contain asbestos. It was recommended to have key parts tested before it left the US. If you do not they are likely to send it for testing and it will cost you way way more, plus you will need to pay to have any parts removed and disposed of.
As it was a few items tested positive and had to be removed. This included rear brake pads, exhaust manifold gasket, cam cover gasket, head gasket and the under body coating.
I did all this before I packed it up for shipping into a container with the rest of our belongings.