I looked at importing a couple of early Z's a few years ago, but uncovered quite a few issues with them before I went ahead.
Then when I was in the US of A I saw a number of cheap examples in person. Put me off the idea of buying a car sight unseen (lots in California were as bad as anywhere else).
If you can't see it in person or don't have an experienced person to view on your behalf it's a bit gamble with the odds against you.
Then add in the problems with importing here, asbestos checks, quarantine, shipping costs and import duties, you're $7k car has cost you $25k by the time it's here and often it's worse than a rusty local car. Plus behind LHD it's resale value is somewhat diminished.
I've seen a few of these bad examples show up on eBay here etc.. needing lots of work to be viable.
If you want to go down the "cheap" route, a late model 280z with fuel injection might be worth a punt. Just remove the god awful US spec bumpers and back date the look to more early S30Z. But even then same risks apply.