I am sure the treaded tires are fine, I want to try them. From my viewpoint vintage racing always seemed to have rules making it very difficult for competitive SCCA cars to be run in Vintage. In the past cars had to be a certain age, had to have steel wheels, only original Ford parts in the motor, no canister shocks etc. I found the tire rule to be quite hypocritical as all of the rules that kept SCCA cars out were meant to "retain originality" but the cars ran on tires they did not race on originally in the USA.
I realize that has all changed (except for Hondas) and you welcome SCCA cars with open arms now which is great. Best of luck and hopefully we will all have a great time racing wherever we choose to do so.