I've done track days in temps of 110+ in the shade a bunch of times
Drink water, stay in the shade, use any air conditioning liberally. If you've got it, use a mister kit (works great in the desert, not sure how well it would work in the humid south). I wear an underarmor shirt under my leathers and soak it in my cooler in between sessions. Makes a big difference. Drinking very cold water makes a big difference as well. Stock up on ice!!!
Luck...I'm supposed to be at the track tomorrow too (Road Atlanta!!!) but my tow vehicle blew up last night
