727 shifting in drag race??

VERY amateur racer here. I have a 440 stroked motor in my 73 scamp. I rebuilt the transmission and put in a Transgo2 shift kit. This year we have only had it out to the track a couple times and allowed the trans to shift automatically. It shifts quickly 1-2-d which may need to be remedied later. We are planning to manually shift in our upcoming races. I have been instructed that the best shift point should be 5800 rpms for this setup. At least start there. My questions are, 1. to shift at 5800, what rpm should I set the tach light? 2. Do you keep the pedal floored during the shift? What are the general concepts to be followed. This is not a bracket race but just Friday test and tune on no prep track. Thanks for any help.
I'm not sure for your set up but if it is 5800 yes floor it, shift it, never let off until you cross the line. Hopefully you don't have any traction issues.
Since it is test and tune you can dial in where it wants to be shifted, when you're comfortable