DC, a friend of mine was also interested in the 240z/260z, even when all the way down south Johor last month. Be prepared that many have not kept it to stock original condition and bastardized the interior/exterior. You may find more 280z but still not as good to look at compare to the 240/260z version.
We may consider looking East Malaysia...hope you managed to find and start your project Classic Z. Cheers!