Do you have an automatic???

Powerglide or Turbo 350 work well towards consistency.

Also, a one-use throttle stop works too, for your launch. You tag it once and it releases to allow full throttle once you are off.

If you are running a Turbo 350, trans fluid temp has an effect on consistent times. Install a trans temp gauge and monitor its temp and adjust accordingly. ALWAYS run the trans at full operating temp. That way, if the other guy stalls at the line and you get a by-run, the waiting-to-go doesn't heat your tranny past where you know its consistent.

Things that make you NOT consistent: fuel coolers, ice on intake, ram air, adjusting tire pressure between heats (set when you get there and leave them alone), adjustable fuel pressure regulators (that hole on top is a vent to atmosphere, and when the track temp/pressure changes, so does your fuel pressure), wearing different shoes every weekend, different amounts of fuel in tank, those cheeseburgers you had for lunch (okay, just kidding, but you are getting the idea)

Dirty tricks make you just that, DIRTY.

I would rather have Honor and Respect than trophies. If I wanted a trophy that bad, I'd go buy one with my winnings.