I believe the racing tires found in these Modified Stocker kits aren't specific to any race tracks, but could be considered "region-specific". What I mean by that is that in the mid-1960's thru mid-1970's, dirt track race cars were built based on parts, (including tires), and methods that were popular, (and successful on the track), in their region.
I believe, in the northeastern region of the US, these big tires were popular during that era; (might have been popular in the southeastern US, too). Here in the midwest, I don't recall ever seeing the big tires on the track.
Any other opinions out there regarding my "regional" theory?