If your going to run nitrous, use it at the lowest level and start working your way up, dont just slap a 200 shot on and hope for the best.
NOS systems makes an entry level kit called "the sniper" and its adjustable from 50hp all the way up to 150hp. You can activate it via a w.o.t. switch or you can activate it with a toggle swicth or some other type of pusbutton switch like a trans brake button whenever you want alittle extra.\
I used this same kit to much sucess in a footbrake bracket car and would only use it when I was either a tad late on the light or I just felt like I wasn't catching the car liek I thought I should be. Also fun to make a full nitrous pass after the races slowed soem at the end of the night. Warning though nitrous is very fun, addictive, so use with caution.
Alcohol would give your motor much more torque and a few more horses especially with the comp your running but I see your class has resistrictions so that's out of the question.
Nitrous would really wake up your motor and it doesnt take much to make big changes going down the track. Things will happen in a hurry so be careful.
Here'a link to the kit I was refering to.
Goodluck, Charles
http://www.jegs.com/webapp/wcs/store...45476_-1_12043