The Baby Grand or Grand American Series (later the Grand Touring Division, or GT for short) was created by NASCAR founder Bill France as an answer to the very popular Trans-Am Series. It's purpose was to also pit pony cars and imported passenger cars against each other but on the NASCAR circuit.
1968 was it's inaugural year, tho they did hold a sort of "try-out" race in 1967 at Daytona - the "Paul Revere 250" was won by Parnelli Jones in his Bud Moore Engineering Trans-Am Cougar (Jerry Titus finished 2nd in his Shelby Mustang). Unfortunately, it was a non-points race and PJ's win has been largely lost to history (it is often quoted that Parnelli never won a race in his Cougar).
It is believed Bud built three 1967 Trans-Am Cougars. At the end of the season, he sold one and took the other two over to the Baby Grand. He also built at least one more Cougar in 1968 exclusively for the Baby Grand. From there it gets very confusing. Tiny raced Cougars with both the '67/68 sheet metal and then later with '69 Sheet metal. Wayne Andrews also raced a Cougar for Bud Moore in the GT series. Period pictures from racing magazines and programs show him racing a '67/68 bodied Cougar and later a '70 bodied Cougar. But then even later, he is back in a '67/68 bodied Cougar. Japanese driver Seiichi Suzuki is also pictured driving a 67/68 bodied Cougar and later a '70 bodied Cougar. Also of note, is another driver after 1970 with the last name of Bannister driving what appears to be one of the 1967 ex-Trans-Am Bud Moore Cougars (you can see where the rear trunk lid is notched for the twin filler caps used on the BME Cougars in '67).
Very confusing!
Anyway, here is a pic of what is, according to the article that appeared in the Shelby American magazine, a 1970 Eliminator with '69 sheet metal that was raced in the '80s!!