Hi mate, i imported a Corrado here when i migrated from the UK.
I did it in 2005, i sent it over in a sole use container, it took 4 weeks to get here and cost me GBP1500.

A good place to start is by tapping DOTARS into google, you'll find all the rules there.
Also have a look at karmanshipping.co.uk, or cargoonline.com.au, these guys work together to get all the customs stuff done for you.
Valuation can sometimes bump the overall cost up as they charge you GST/Tax based on the value, but with a Mk2, they'll just compare it to the value of one here.
I think i was to do it, i'd prefer to go o/s and look/drive the car, buy it and take it to the shippers... and have a holiday at the same time - but plenty of people on here have bought cars sight unseen and organised it all from a chair!
I would have a look for a thread but can't be bothered to be honest It's quite simple, just look up the links i sent you..
Price wise it's always hard to say, depends what needs to be done to it and who does the work. I paid all up around $8000 from my driveway in the UK, to fully registered and driving in Australia. I probably paid a premium, but i just wanted it sorted quickly, i'm a bit impatient like that!
You can get different permits for track cars, could work out cheaper, well, you'd think so... have a man look