Nitrous ? ? ?

You'd likely gain more of a cooling effect from the nitrous than actual power from it with this combo...but cooling is power too - just want to clarify how it would make the power. And because of the cooling, it allows higher AFR and/or timing. My 2 cents - this should be safe.
 
A local cobra owner is using a NX kit with a 35 wet shot he saw an increase of 56rwhp with it. Build motor, vortech, etc..
Personally I won't do a dry shot on your combo but that's just me. Can you monitor your AF ratio? if so then you may not need a tune just watch it. Of course the safest action would be to go put it on a dyno with a wideband and at least check everything. Have you considered going with the Watermethanol injection?