Mike, experiment, practice and take notes of everything.

IF race day props are not to be issued then I would suggest to get a bag of 9x6 APC's and run them all to see which will yield the best RPM's,,, all 9x6's are not the same,,, then keep the best one for Race Day use only. Never take off at peak RPM or else you will go lean in a few laps, slow up, get lapped and possibly cook the engine. Take off RPM should be around 500 down from peak. Change out the muffler thru bolt to a 60 muffler bolt and have extra muffler gaskets on hand,,, if your muffler is leaky, your losing RPM's. Debur the baffle inside the muffler.

Find out what the club uses for fuel on Race day and practice with that only,,,

Learn to read your plug. By doing that you will know how your engine is running. A Golden honey color look to the plug with a shinny coil is what you want. IF there's no color to it,,, its running rich. Suggest to procure some jewlers eye magnifiers to get a better look at the coil in the plug,,, if it looks blistery, little spec's or bubbles or any de-formities of the coil, it ran to hot or lean. The condition of the coil will tell all after each run.

Other than that, there's really not much one can do to a one stock engine class of Racing. Don t try to drill out the muffler exhaust port, port match the exhaust and intakes, enlarge the carb or change the angle of ports to include the crank port, shave out the exhaust rib(that will really make the tt pro 40 zing) or run without the baffle,,,

it will get noticed

BV