I looked bring my hatch over to QLD when I moved from NZ 6 years ago and gave it up as a bad idea
It can be easyier if the car has previously been registered in OZ, however if your car has crash history forget it
you will need all the tags including ADR which a NZ car will not have
You will need to install all pollution control crap on the car, which a NZ car will not have, so will have to source and install, this will stuff up the tune of you car as no doubt is was not setup for it
Also have to have the car inspected and you can resonibly expect that to be differicult
Also if you car is anything like mine was, it was built to meet NZ requirements and stuff here is a lot tighter, I was looking at new exhaust, getting the car engineered for all the mods and then rego and insurance over here are way way more expensive, I was $200 a year full rego in NZ, QLD more like $1000 for a V8
I paid $200 a year comprehenive insurance over here I pay $700 for a shit box Suzuki Swift, stock standard so I hate to think what V8 Torana would be unless it was club rego and never ever driven but then whats the point in that.
What I did was left the car in storage for 9 months and looked at what would be required to get it here and on the road, once I realised just how much was involved I sold my car in NZ as the easier option, and then the prices crashed so good move in the end, that said Torana hatchs are expensive over here and relativily cheap and unloved in NZ, and American cars are expensive in NZ and cheap (ish) over here.
The other advanage of leaving the car in storage for a bit as after being here for a while you might not find the place as attractive as you first thought, I have been bittin a couple of times by spiders, lucky I am resonably imune, however been attacked by a snake in a AC unit scared the $^&* out me for days, literly staring death in the face. I work in remote sites, a few days later a guy I work with a couple of time had the same thing happen to him they reckon he was dead before his body hit the ground.
Although most Aussie will tell you the chances of seeing a snake are remote, it does happen and I am very aware that with my work my chances of contact are much much higher