I'm not sure about the touring class but in ROAR racing rules for off road (which is usually what race events use as guidlines), there are no 2 speed trans allowed. You'll also need to verify the tank size and engine size qualify.
You should download the rules from ROAR and familiarize yourself with them. I Just looked them over real quick and there is a rule stated clearly that 2 speed trans are just not allowed. Period. Before you get much further, if you bought this car for racing only, make SURE that you can make it a single speed. For that matter, be sure it qualifies in all other ways. Even if your first track isn't so stuck on all the rules, I'm sure that the 2 speed will be an issue. If you end up doing well and competing in other tracks, you will eventually be held to following all the roar rules. It would suck to have bought a car that you can't compete with!