If you didn't see it in the Trans Am pace car thread, I have found a treasure trove of vintage pictures taken at racing events run at Sebring Circuit in Sebring, Florida:
https://sebringrace.com/index.html All photos came from this source unless otherwise noted.
This thread will feature the color pictures of the cars competing in the over 2.0 liter class during the first ever Trans Am event ever held. It was called the Sebring 4 Hour International Touring Car Race and it was held at Sebring, Circuit in Sebring, Florida between noon and 4:00 pm on Friday, March 25, 1966. Jochen Rindt won it overall in his 1966 Alfa Romeo 1600 GTA and the combination of Bob Tullius and Tony Adamowicz won the over 2.0 liter class in their 1966 Dodge Dart.
Here are a couple of photos showing the rear of the field at the start of the event. Mostly under 2.0 liter cars shown.