In front of the rear tire look underneath (inside the rear quarter lip) in front of the chapmen arm (lower control arm) there is a T shape on the uni-body with a hole in it. Where the 2 intersect on the inside place the jack stand there.
You can see the jack stand on my 240Z in relation to where you have to put the jack stand.
Since mine is up in the air now because I replaced the fuel tank vent lines, upgrade diff, and e-brake cable. If you need a better picture I can take one tonight and post it...