I actually took a picture of it yesterday. I had my camera, saw an interesting perspective, and snapped it.
Since I last updated, the car has gotten giant 14'' brakes, new 200tw Nexen tires, and a variety of other wild bullshit that I really didn't need to spend money on, but did anyways like a Eurospec rear fog light.
For shits and giggles, our Time Attack 370Z circa this morning still in Global Time Attack trim. We took first place in Street RWD class at Road Atlanta Saturday in this monster. It makes about 560whp and still has a lot left in it.
They're okay cars. They had a VK45DE (V8) hence the M45. It's a first gen Y34 chassis, similar to the G35 but lacking the aftermarket support.
The Y34 chassis was only made from 07/02-12/04 so its short production run makes it an oddity. Their maintenance cost isn't too terrible, but that's assuming it doesn't need a ton of work right off the bat. (Lets be honest, a high mileage infiniti thats over a decade old is probably going to be clapped out unless you spend a fair amount on a nice car)
You'll honestly probably be happier in the long run with a G35. Great aftermarket support, easy to find, fun to drive, etc.
Best place to start looking is valvetrain. Cams, valve springs, maybe even some port work just to help it flow.
It probably has a Weber 32/36 carb on it. That's a progressive carb made by weber for economical performance. Weber makes a 38/38 synchronous carb that is a bit larger, would work well with a bit bigger cam and supply more than enough air for a high revving A-series engine. I ran one on my 2.2 stroker years back and loved the response, it wasn't nearly enough carb for me, but it'll be more than enough for an itty bitty A-series engine.