I read through the rules but still have a question about fuel. Is it pump gas only.. what is the highest octane we can use? been running 100LL in my GTX.

no octane limits

Thanks Ted..I was hating thoght of putting 93 or less in..

This is the rule for fuel

3.11 Gasoline as outlined here is the only acceptable fuel for use in SuperCar ShootOuts.
The SuperCar tech inspector reserves the right to check gasoline at any time during competition. Gasoline is defined as a mixture of hydrocarbons only. The average dielectric constant (D.C.) for the hydrocarbons that compromises gasoline is 2.025. This is defined as a reading of "0" on the fuel-check meter.
3.12 Nitrous Oxide is NOT allowed. ANYONE USING NITROUS OXIDE WILL BE BANNED FROM PARTICIPATING FOR LIFE!
3.13 Propylene Oxide, Nitro-methane, alcohol and nitro-propane are NOT allowed.