I haven't been following this thread very closely,,,
,since I have no idea (at the moment) when my 40 will arrive,,,,or be track ready.
Although, I live only 10 minutes from Heartland Park, Topeka,,,,,,my vote would be for Road America.
I believe it to be the ideal course for these cars to run in the US.
The SAAC has a large event every June at Hallett in Oklhoma, but it is a very short & tight course at only 1.8 miles long.
Mid-Ohio could be another possible option?
It is close enough to the East coast, yet not clear across the country for those on the West.
Wherever it is to be held...if I have a running car, I WILL be there.
......with helmet/ racing gear,,,, and of course my grille & plenty of Kansas BBQ sauce!