Kreb,
Australia has one of the worlds best stocks of older cars due to our weather (dry in most parts), the high cost of importing the vehicles and Australian's buying up early classic US iron.
We have thousands of early Mustangs, Vettes etc down under. They are usually in better condition than yours and are actually quite reasonably priced.
When you look at old race cars we were the last stop on the race calendar (forgetting NZ which is pretty easy) joking KIWIS! and the cars were usually sold off to save shipping them back to Europe. The teams would build/buy new cars with the proceeds of the sale and the funds saved in return shipping. For this reason we ended up with a lot of rare toys.
Your 1UZ's are cheap but after shipping no chaeper than ours. The cheapest I've heard of was agood clean engine for $350 or US$260.00. Engines aside I don't think there's much we need on the Lexus front. Performance parts such as gaskets, studs, oil coolers etc from the likes of Summit, ARP etc are hard to get at reasonable prices but we can get most stuff we want off the net.