I do work at the local track on occassion (Langley Speedway). Its small and has lots viewpoints. Texas is a big arsed track and you should be able to bring in the 300 2.8, but depending on your seats, you might be shooting through the fence and will have lots of people standing infront of you during exciting (read crashes) parts of the race. Pit Pass will give you access to crews and the 70-200 or say 24-105 would get a good lens for the area. I think they are cold pit so no garage access and it will only be valid during pre race.