You might want to argue the point of Stick Shift drag racing with Angilo....or any of the rest of the United Manual Transmission Racers....I have seen more consistency out of some of those guys than I have ever seen from a slush box.
(Tell Angilo I said hey!)
The biggest modification you can make is to get as much seat time as you can in whatever you can. Sharpen your reaction times, learn to consitently stage and burnout. Learn how the track changes with the weather and cars. Tighten the nut that holds the wheel and you'll go far!