IMHO and going by the racing results I don’t see how one can conclude that the Mustang platform was superior to the Cougar.
If you look at the 1967 Trans-Am race entry lists, you’ll notice 6, 8, 9 or more Mustangs, and usually only 2 Cougars. 3 factory Cougars at Sebring, plus an independent every once-in-a-while.
Bud Moore said they were kicking the Mustang’s ass and Ford wasn’t happy about it. Team Cougar driver Ed Leslie said his starter fell off at one race. He said something along the lines of how the hell does your starter fall off? He suspected there might have been some foul play.
Yes, regular production for the street Cougars were a little heavier than Mustangs, but all of the Trans-Am race car’s were under weight. The shops had dozens of ways to take weight out of the cars, some legal, most not like acid dipping.
After a race when the cars were weighed to make sure they reached the minimum requirement, there were all sorts of tricks the teams used. Bud was known to change the tires on his Cougars and put on tires that were filled with water, or have the driver leave his “helmet” in the seat, which was full of led weights.
All this to say that the weight disadvantage talk doesn’t really…. hold weight
As we all know, Bud took his Cougars to NASCAR and won the GT Championship in 1968 while the Shelby Mustangs, hobbled by flawed race engines that Ford built in-house and forced Shelby to use lost to the Penske Camaros.
In the ‘69 Trans-Am season Ford brought Bud back in but they had him build and campaign Mustangs instead. So in 1969 both Shelby and Bud Moore had factory teams but the Penske Camaros took their second championship.
For 1970 Shelby was out and Bud Moore was the only factory team campaigning the famous “school bus yellow” Mustangs in what many consider the pinnacle Trans-Am season of that era with Bud taking the championship.
Just imagine if Ford had allowed BME to build and race the Cougars in TA all those years.
There is plenty of info to be had out there on both series. For the NASCAR Grand Touring/Grand American series old Stock Car Racing magazines, Competition Press & Autoweek newspapers and original racing programs are jammed full of photos and racing statistics.