How much nitrous for a stock piston?

I agree that you may not need to pull out any timing, but if i was you i would...depending on how much of a shot you want, lets say the 150, id retard about 4-6 degrees...it probably wont need this, but its better to do this, read the plugs, and then advance it from there if need be...the key to having your motor live is all in the tune and the only way your gonna know is by getting REAL good at reading plugs...remember when you read them to shut the motor off right after the run, otherwise it will not be accurate

oh and a window switch will definitely be your friend, so i would invest in one no if's and's or buts about it....what kind of pump are you using as the dedicated pump?