I don't have much practical advise for you other than that in SW Div. we have some stout STU cars running and one rotary powered miata hitting the track soon.

In STL we have a smattering of ITA/SM miatas ... That's going to change ... The MW Div. STL field at Hallett looked like a larger field of the same.

Your car should be competitive in the STL fields , maybe not in the STU group unless it's developed.