727 dust shield

If your racing at the track on teck insp do you have to have the lower dust shield cover on you 727 transmission or can you leave it off.
MAYBE thinking to much but since the trans vent is on the front pump will the air rushing in to the bell housing cause the fluid to get forced
out of the dip stick tube with out the dust cover on ? Al ways ran a stick first auto track car . THANKS

I have done over 100 for a couple of hours without the shield with no issues if that answers your question.

No idea what tech says about it.