100 horse shot of nos for 440?

Actually 950 pound bottle pressure is just what most people use because thats what most company's test at.

You can use any n2o bottle pound as a starting point.
When you start to blueprint a NOS system it's important to have n2o pressure constant threw run out the run.
Thats why some systems require 2 bottles.s
Meaning you have to flow your plate on the bench to find out if your bottle has enough fluid to make your pass and if your pump will keep up for the pass.

I know for 100 hp you don't need to do this,just info.

Also you should have a low fuel shut down switch and a secondary n2o soleniod inline of the primary one for safety.

Steve Johnson of Induction Solutions has great blueprinted kits.
He's 4-5 in a row against The Sheiks Pro-Mod cars