new to site nitrous q's

I advise against the NOS with those pistons. They say they can take it but, what is your timing set at? I'd be very careful, timing, nitrous and KB's is a fine line to run.
I dont think a blue is enough for both. I know from experience, nitrous works great! It takes a toll. Especially on an engine not set up for it.
You have a good combo. 7.40s is fast.