Regarding the shot of NOS. Your motor can handle the shot, just make sure to get a CORRECT tune for your car. Doesn't matter if you have a DART block and all the forged internals you can buy. If you have a $hitty tune, your motor will go bye-bye!!!
Don't skimp on the tune
you can run a 150 shot on stock fuel system with the proper TUNE but it is a good idea to uograde your fuel system start with a fuel pressure regulator then fuel pump your stock 19lbs injectors can handle a 150 shot but they will be getting a workout when you spraying if you have boltons the next thing after that I would move up to 24lbs injectors and make sure to have fun with the JUICE lol
With a proper tune (As mentioned) on a perfect day with perfect conditions ..... SURE!!!! 100%
Now here come the "But".
What if your bottle pressure just happens to be sitting at 1100 instead of the 950 you had it tuned at? More bottle pressure = more air = lean.
Perhaps bad air (good air = bad air - because you will gain HP)
Or, lets say the pump fails for a second ...... or your fuel tank is a little low ..... or you detonate because of bad gas ....
The point I am making is that if ANY of these happen on a 150 shot with stock internals you are going to think it's the 4th of July.
a 75 shot on the other hand is MUCH more forgiving ........
NOW That being said..... with a proper tune and a REALLY good set up (proper pump/pumps/injectors/warmer/window switch/fuel pressure cut off/WOT switch/ and any other bells and whistles I forgot to mention), you are likely to be OK, I just don't want you to think it's "no problem" and then have you blow it up without being told the whole story.
get a tune for however nitrous your going to run. get a wet kit, not a dry kit. normal goodies like bottle warmer, window switch....and run a 75-100. After 100 it will melt the pistons. I know on my 97's pistons the rings aren't really protected and are pretty close to the top so they get torn up easily.
I've always read that a car that you want to be a daily driver, with its tune should never go over 20 hp per cyclinder. 8 Cyclinders = 160 hp. Then again it's hope that each cyclinder gets the correct amount of nitrious, but again thats why they developed direct port.