You can look up the VIN on http://gtr-registry.com/ to confirm.
If you're patient (e.g. willing to wait 1 year), you can get someone like iron chef to look for a nice GT-t.
But, there should be enough R34s floating around, you'll have to be patient either way.
What about buying interstate? You could find a nice, close-to-standard-as-possible one with import papers.