340 Dart disappointing time slip

@MrBubbles211

Try leaving the line at a rpm that doesn't spin the tires.
Do not "Stomp" the gas pedal, ease into it. Roll the foot into the throttle.
Temporarily hook up a tach (even if there is a stock tach.) and shift at 5400 for a test. Then try 5700. See if you went faster or slower.
Slower, try 5600.
Slower @ 5600? Try 5400.
This is finding the sweet spot.
Try and avoid tire spin. Some is OK. Less is better.
Talk to others that have the same tire to see what the tire likes for burnouts in the water box.

"Some people" here can write Scientific automotive bible thick books on this subject but none of it means JACK! until you actually do this at the strip.