what is the limit????
 

my pops has a 93 300zx auto and he is putting 305 hp and 302 ft.lbs. to the ground. we have all the stillen upgrades and nitrous oxide from holley. how much horsepower can the n/a handle with stock internals. we have a .47 nozzle for more power but my pops thinks his car cant handle it. the car is running strong and has 119326 on the odometer. will his engine blow with the new shot or can we squeeze mor power with stock internals?

any answers would be appreciated!!!

The stock internals on the n/a are quite strong. I've seen the Z32 n/a's with nitrous before and have help up quite well. Naturally the nature of nitrous is strenuous on any engine, but the VG30DE is quite stout in both of its forms.