Yes that is the Fairlady Z-L, with the Jeco Rally Clock, under your dash in the passenger footwell there should be a yellow box, that is the oscillator.
http://www.viczcar.com/forum/topic/12840-twin-knob-rally-clock-install-in-to-an-early-s30z/
I am guessing the clock has maybe stopped working at this stage? But if you want it restored I'd recommend Ron at Zclocks.com he's done about 3 of these clocks for me now. Does top quality work and I love these clocks.
The Z-S had more basic trim options, the radio / antenna switch was no installed, the clock was the basic Jeco clock (non Rally Clock) and the bumpers didn't have the rubber trim as mentioned above, along with other subtle differences.
Based on the extra delimiters in your Temp / Oil pressure gauge I'm guessing this car is 70 or 71? *Edit you said 71 in the first post.
Do you have any photos of the fog lamps or what's left of them?