Though I'm not a fan of Spec clutches that stage 3 should hold your h/p easily.
I'm making 450ish to the tires w/spray, launch on the 2step at 5k and my NAPA remanufactured clutch holds fine and is smooth as butter in traffic.

Would I recommend you do this, NO. I wasn't planning on nitrous when I built my car it just happened. just saying I have a LOT LESS clutch w/ no issues.
A SPEC-3 SHOULD HOLD IF INSTALLED CORRECTLY