To spray or not to spray

Hey guys, A family friend mentioned to me today that he has a complete nitrous setup that he would hold for me if i wanted it. How bad is it to run nitrous? I have a built 360 around 400 hp. How much hp would i gain from it.??? This idea would be for further down the road but i dont want to pass up on a sweet deal. It would never see use on the street only at the track.

7DUSTER3