In MY perfect world, I would make everyone put on those skinny ass, hard as shit tires they run at Goodwood and other Euro events. If you ain't slidin' you ain't drivin'
Sounds like you'd enjoy entering a drifting event... I assume that the tires are OK, but that the contact and carnage at these events would not be OK? I've never understood the satisfaction of taking your valuable antique race car to Goodwood, handing it over to your hired pro shoe, having him beat the daylights out of it (they're professional race car drivers not museum curators), loading all the pieces back onto your trailer, and then bragging about what a great thing it was.
My point is quite simple, what's the point about worrying over what tires are legal and which are not? Absolutely none of them have anything even remotely in common with what was raced on in the 70s... thank God. If they fit the legal rim size and fit inside the fender line, then they are legal in my mind.
When I first ran in vintage events (in my Arkley... talk about AAARGGH!), I was using the Hoosier TDs. I loved them, but they did tend to lock-up easily under braking and flat spot. Finally at the last event of the season I ruined my fronts and the only tires for sale at the track were with Sasco and they were Avon ACB10s. These weren't "legal" for my class but I had no option so I laid out nearly a grand and used them the rest of the weekend. The following year I bought a new set of Hoosiers and thought I'd use the Avons for practice and race on the Hoosiers. I went to Mid-Ohio and after practice was half-way through mounting the Hoosiers when a breathless JFW corralled me and read me the riot act about being such a bad, bad guy for being seen with the Avons... So thus ended my use of the Avons and began the friendship with JFW.
The reason I tell this little story is to comment that IF there was any sort of advantage to the Avons over the Hoosiers, my little oxcart couldn't use it. And my lap times didn't show it. So the only reason to outlaw them was strictly their looks. Which at speed, on the track, is more or less a black round thing.
So now I'm racing on slicks with the SCCA. I'm a little new to this at the moment, but so far their main advantage does not seem to be overall lateral grip, but much better braking power and more consistent grip through the entire race session. Other than that, the Hoosier TDs are just as much fun.
Speaking of fun, I think a "boardroom" face-to-face discussion about all the many rules could be good fun, and probably inject a lot more good humor into what we care about... Just a thought.
Oh yeah, here's a picture of the Arkley in case you were curious.