for b series try skunk2 st 1. they offer a nice mix of power and street driveability. upgrade to skunk springs or integra type r ones. u can also just put a itr intake cam in, cause the exhaust cam on all the b series vtecs should be the same profile. as far as timing- when running nitrous retard cam timing and retard ignition timing a little(maybe 16-18degrees btdc). this is to avoid detonation- wich is the devil
oh make sure u get it tuned on a dyno with the nitrous to make sure u arent leaning out while spraying- cause thats baaadd newz too