If anyone has recipes, now would be the time.
TransAm will never be what it was nearly 50 years ago. The current iteration is a sort of club/semi-pro series, struggling for traction in a world of sportscar series. Keep it simple so you are not penalizing the current competitors with endless upgrades that will have the effect of washing competitors out. Instead, have large fields of noisy cars that look kinda sorta what the public owns. Have the loud cars squirm around for traction.
Make sure hot dogs and beer are available from trackside vendors. Make it fun to go watch. Keep it simple.