Let me shed some light on the nitrous setups.
We ran a pro fogger on a 496 bbc last year and tried using one large pump bg400, and t's off for the nitrous gas line.
Well, We had pressure guages on both lines and it became a problem feeding the 300 shot pro fogger and the 1150 carb at the same time.
the pro fogger would steal carb fuel and the car would run lean. I tried two regulators , no change. It seems the path of least resistance is where the fuel will flow. We opted for a smaller pump and seperate gas line to feed the nitrous system and presured it to 7 psi and it was flawless.
If you are serious about the system , do youself a favor and install a seperate fuel pump and feed line.