Turbo on a n.a. 300zx?

I have a couple of old turbos off a 5.9 cummins
(hx35) my buddy has a 300 zx he wants to make in
to a project (drift/track car) rebuild kit is only like
65$ and 75 for a new stock compressor wheel or i
could buy a a.m. for quicker spool cause i doubt id
need more boost than the stock p.s.i. for the car.
How much p.s.i. befor it blows?