Sweet! Sounds like a good combo you got going. Duh, I must have forgot that in the first post you mentioned the 347.
That pump should be sufficient...but I'd double check though and call up NOS tech., describe the fuel pump to them and that you have the stocker still in the tank and they'll be able to tell you for sure if you are ok. Because the dry nitrous kit boosts the fuel pressure up to 80psi. when the nitrous is going into the motor. Good luck.