Joe:
Chuck Tator does not do NOS. He calls it a poor man's supercharger. I guess I'm a bum.
Chris is the way to go at East Coast Supercharging. He did mine. He no longer has a Viper, but has done them and he does a nice neat job.
I would suggest going with a dual bottle if you can fit them, and get the guages for pressure mounted in the car so you can see them from inside. I wish I did that.
Good luck,
Andrew