Thanks guys. Three Cobras cruising down to the coast with Dad in his Arntz and a mate in his RMC was fantastic!
Because it's 30+ years old, in Queensland you can either have full rego or club/historic rego and leave it LHD. There are a few threads about importing cars into Australia, but it's basically a matter of getting every bit of paperwork you could possibly imagine (including evidence of first registration pre-1982 for LHD, and a million other supporting documents), then pay the full purchase price and only then can you apply to import the car. If it's knocked back at that point, you're stuck owning a car that can't leave the States!
It's not a process to go through if you don't like a challenge...!