Blowers and n2o are damn tricky and one should darn well know what they are doing before going there!
The most knowledgable people on the subject that I've come across are @ Wilson Manifolds (ProFlow Nitrous) in Florida. You can go to their website @ www.wilsonmanifolds.com to get some initial info. After that you might call and talk w/ Steve who knows his stuff (an "old" NHRA type who is in charge of running their nitrous car) or Brandon who builds their manifolds: Keith Wilson is almost impossible to get ahold of (Note though, he personally checks every major part they build himself ... he is a perfectionist).
Tell whomever you speek with that someone from the Black Bear Team put you onto them and it might help?
Jak
P.S. Nitrous is tricky with aspirated engines ...with blowers, know what your doing. That having been said, I would not use anyone's second hand nitrous parts (unless they have been checked and recert.'d by the manufacturer) as it could cost you your engine.