Some questions for you autocross guys

cjwsrt6

I am looking into purchasing a Nismo/sport 370z very soon but have a few questions regarding these cars.

1. Looking on auto trader there are a lot of Nismo's for sale with right at 20-30,000 miles, what, if any are the "bads" of these cars, any issues that arise mechanically?

2. This will be primarily my autocross car, what is the max negative camber you can get out of these cars stock or with using eccentric bolts?

3. Using stock size rims and stock height what is the max front tire size you can get under the front without rubbing?.. im hoping to get 295/35/18 on all 4 corners using the +/- 1 inch diameter rule this year. If not could one get 295/30/19 up front?

4. Has anyone ran both a sport and nismo 370z, the pax difference is about .4 on a 40 second course from BS to CS, does the little extra the nismo have make that up? The nismo has a slightly larger rim width but can you actually take advantage of this up front?

5. Leg room, this i can solve with a test drive but my girlfriend and i are both about 5'8 and my current car is a little small with leg room for the passenger.

Thanks for any help, if I should move these questions to another section please let me know and i will do so.