ordered nitrous am i missing anything.

I have an 03 gt a cai and full exhuast. I ordered a Zex 82023 wet kit. My main question is timing. I did some searches but didnt see anything specific. The Zex site states at a 75 shot can be run on 0 deg. But, at 100 shot should be at 2 neg. I dont have the ability to retard the timing, and i was wanting to run at 100 shot. on a 1-10 scale 10 being detonation how risky would it be to run 100 shot at 0 deg timing w/ colder plugs?

Ive been looking localy for Colder plugs but the local national auto stores dont seem to carry any. been to about 5 stores with no luck. Any sugestions where to look?

Without taking it to a shop is there any way i can check the A/F ratio? I did a search and pretty much seen that the gauges I could install wouldnt be very reliable. Without spending like $600 on a quality set up.

Been researching and tryn to gather information for the better part of a year on nitrous and now that Im almost ready to install I just want to make sure i got all my bases covered. Never owned a nitrous equipped vehicle (if that isnt obvious) and would love any tips and or pointers on installing the wet kit.

I dont have alot of experiance working on cars but with haynes and stangnet Im pretty sure i can do most my installs tools permitting. Thanks in advance for the info and patiance with yet another nitrous thread.

I was tryn to lock down which spark plug was for the 03 gt and could not figure out whether NGK BP7EFS (PN-3526) or NGK BR7EF (PN-3346) was for my year. Also the auto store could not find the autolite AR94. If any one has any info on which NGK plug or what the autolite plug part number is i would greatly appreciate the info.

thanks.