I have MPS3 up front and N8000 on the rear (how i bought the car) done two track sessions this year and had no issues. Next time il be looking to axle match at least to the same brand of tyre, manly for aesthetics.
Ive read as standard the 350z at speed has slight understeer on turn in, so to have a pair of rubbers up front with a bit more bite than the rears can only be a good thing.