I'm running a 70 shot and would not recommend going higher without changing your fuel pump. When the NOS is first starting to spray, it takes time for your fuel system to catch up with the additional fuel required to keep your air/fuel ratio in the middle (Stoich). I had my car on a dyno with an air/fuel probe in the tailpipe. As soon as the NOS begins to flow, the motor tends to run lean until the fuel return is pinched off and the pressure starts to rise. If you were to add a 100hp jet with your stock pump, the time needed for the fuel side to recover will be increased enough that the motor will be running leaner longer. This to me is not safe, as I do not know how much the stock pistons and/or rings can take before problems begin.
If you want to run more than a 70 shot, I would suggest running a direct port system or going with a larger fuel pump.
YOu can easily run more power if you set it up correctly!!