Tracking (ring racing) plus boost is still a limited subject.
Very few are on the track with TT, I know a few with SC hitting up track events but that is a good bit less heat and low to mid 400whp range so very different. On the statement of safe, it comes down to keeping the engine in check. Such as keep coolant (water/oil/etc) as low as you can while pushing the car and then a very solid tune that does not push the engine. Especially since on the track you spend much of the time in the upper RPM range to maximize speed/performance, this can be brutal for a stock block.
Carlitos, with many engines pushing mid 500 and above I would say depending on your power requirement and how often you track I would skip the built block. Keeping the engine untouched can be a very wise choice, because once you open it up you introduce a whole new level of problems, especially on the track.
Here is a good write up by DjTodd on TT on the track:
DJTODD's Journal - 2012 370z Nismo
At the top of the thread is his current build list on the car to give you an idea of what he has done.