You can runa 150 shot of nitrous virtually safely if and only if you have an upgraded fuel system up to the task, a new wider MAF to help get more air in, and above all else a WET nitrous system. NOS and Venom make the best that I have seen. Nos has a system that plugs in before your injectors and Venom has the best computer controlled system I have seen yet... the downsides... though you have 150 hp at your fingertips, the price of a wet system is about a grand if you are getting good quality and you have to keep refilling the bottle. Save for a supercharger, and in the mean time start upgrading your fuel, exhaust, and air induction systems in preparation for the supercharger. I would get 30# lb injectors and as wide a MAF and throttle body I could. 2.5 inch exhaust piping is the biggest I would go, with of course 3.5 inch tips
a new fuel pump also. When you get the supercharger, make sure to get a chip also or you wont be getting the max out of your motor.