Power brake (brake all the way down, part throttle) till 2200 rpm and then hold it there. Release brake, push throttle pedal to the floor. Wait till you cross the line. That's it. Unless you upgrade to a higher stall TQ converter (which really won't net you anything right now).

To decrease the power slug known as the ATX look up the final drive mod for the Auto trans. That should help give the car some needed pep. Not alot but it'll help (more than most other mods will).

Also no back to back runs without ample cool down. Heat kills the ATX.