Recently Mike K./Swede70 posted a link to some great color footage of the 1968 Trans Am races held at Limerock and Bryar. At the beginning of the footage you can see the drivers as they leave pit lane for their parade around the track prior to the race. They are riding in AMX's, Javelins, Mustangs, and Corvettes. See it here:
https://www.youtube.com/watch?v=UZz2AJ_mpRA&feature=youtu.be&fbclid=IwAR2KTdgUICqIqWUTIMSbkGCYeufS7-Z-gPXc1QedGGrv4MH3iHO3SNmP2zEIn the footage you also get a glimpse of the light blue 1968 Mercury Cougar that paced the race. Additional photos of this car can be seen in Reply #124 on page nine of this thread as well as Reply #198 on page 14.
The footage also shows an orange Iso Grifo that was used in some official capacity by the track prior to the race. According to Wikipedia, "The Iso Grifo is a limited production grand tourer automobile manufactured by Italian Iso Autoveicoli S.p.A. between 1965 and 1974. Intended to compete with Ferrari and Maserati GTs, it utilized a series of American powertrains and components supplied by Chevrolet and Ford to ensure performance and maximize reliability. Styling was done by Giorgetto Giugiaro at Bertone, while the mechanicals were the work of Giotto Bizzarrini. The first production GL models appeared in 1965 and were powered by American Chevrolet Corvette small-block 327 (5.4-litre) V8s fitted to American supplied Borg-Warner 4-speed manual transmissions. The 5.4-litre engine developed 300 hp (220 kW) in its standard form and could reach 110 km/h (68 mph) in first gear. In 1968 the Grifo 7 Litri was introduced with a Chevrolet L71 big-block engine, a Tri-Power version of the 427 engine. The massive power plant required several mechanical changes to the car in order to fit, i.e. strengthened chassis components as well as an enlarged engine compartment with reinforced mounts. A large hood scoop (dubbed "Penthouse" due to its size) was added to clear for the engine's deck height. It produced an officially advertised minimum of 435 hp (324 kW) at 5800 rpm, which was a somewhat conservative rating given the engine's well known and proven performance potential. The factory claimed it could reach a top speed of 300 km/h (186 mph). In total, 322 Series I and 78 Series II cars were built for a total of 413 Grifos, 90 of which were 7-litre."
In the comment section, "jcalla76" wrote: "That is my father and mother, Skip and Carmen Callanan, in the Iso Grifo pace car, supplied by the GT Motorcar company of Norwalk, CT. A gold Grifo would also pace the event in ‘69 and can be seen in Jim Garner’s documentary The Racing Scene."
The comment about the "gold Grifo" pacing the 1969 Trans Am race can not be confirmed because the footage in the documentary shows the "gold Grifo" pacing the Formula Continental/F 5000 event not the Trans Am race. He might be correct but I don't have any other evidence to prove it.