The main needle will be at 2 1/2 turns out in cooler weather, in hot weather 75 degrees or more maybe 2 turns out.
If you use fuel with more oil it will have to be leaned out even more. The low end should be flush or sticking out just a 1/32nd or so. Run the car hard and fast, bring it to stop. If the idle stays elavated for a couple of seconds, then goes back to normal, the low end needle is too lean. Running Blue thunder race, 20 % nitro in 60 to 70 degree weather the temp of the motor should never exceed 240. Put water on the cooling head, if it boils way in under 4 seconds its too hot.
You should richen the main needle 1/16th of a turn.
Really depends on temp, fuel, nitro content etc.