I've actually been thinking of setting up a service to import hard to find Z parts to Australia from Japan. So maybe I'm going the wrong direction?
There are no 432 Z's in Australia that I'm aware of, and I don't know of any that have ever been in Australia. I've known of a couple of Toyota 2000GT's but no special Z's. I don't even think we have a genuine HS30-H in Australia hiding away anywhere...
Phil - with regard to your original question it's hard to say if these cars are more valuable in Australia than an Aussie classic like a Falcon GT. I would say no, the Aussie muscle cars are getting silly money really, for cars that were *ahem* not all that great really....I mean I definitely appreciate some of the old Aussie icons and would love to own a few of them, but build quality always put me off and the styling was never quite my cup of tea with a few exceptions of course.
There is also the appeal of large displacement engines in many of those cars, compared with the Japanese cars with smaller motors.
To be honest I've never understood why the Z's values have struggled when compared with other vintage cars especially some of the British lemons. It may have something to do with sheer volume of them sold? I've seen some good cars sell for good money in Europe / UK, but if I was seriously considering a car. I'd definitely purchase an ex-californian car to Europe - rust free and many tidy original cars still come up often enough on Ebay. Much better than a rotten UK car.
How much interest has their been in the Skyline you have on eBay right now? I've seen more and more interest in importing these cars to places outside of Japan in recent years.
I'm also curious what the old rotary's are selling or in Japan right now? It's a shame there are not many original R100's, RX-2, RX-3, RX-4 in Australia. In Japan they seem to be a lot more 'period correct' looking and would sell for good money I think..