Yes, am interested in Auto cross and Vintage racing, want to look at setup rules for both....You posted a while back, alas gone....As far as I can see!!!!
My two cents is that CAM-Traditional is a way to spend a lot of money in directions that don't align with most vintage racing.
E Street Prepared,
C Prepared
Street Mod (maybe)
or if the local club has Historic Classes, those probably will align better.