Check out the compucar system you wont be dissapointed and they are very easy to deal with. I got mine from my local speed shop. If you do a search on google or something you can find a dealer.
I would reccomend the NOS Nozzle kit. It's the best kit out there and the safest period. Just make sure you get a good fuel pump (like twin 03 cobra pumps with a BAP) and definetly have a custom dynotune with a flip chip done.
Compucar is only 45 min from me. I know several people that have shattered engines on mod motors. The cars that I have seen run the best on Compucar are not Mod motor cars. IMO NX or NOS is the way to go. Not necessarily the NOS nozzle. From people that race, most still trust the NX and NOS.