Well, in August of 68 my Dad bought my 65 Barracuda with a Commando 273.
We were living in Cochran at the time. He taught at Middle Georgia College. I don't remember any fast Mustangs around Cochran. Not sure I ever saw a hi-po 289 Mustang on the road. Maybe in other parts of the country they were more common.
There at ABAC in 66-67 there were 442s, GTOs, All dinds of Fords, few Mopars, even Jag. Most everything. All kids of cool cars. Most cool cars were just transportation that got there a little quicker and cooler!