Yes, the same car. Color reproduction on 39 year old negatives sketchy at best. That's Larry in the jean jacket behind the car at the Utica test track in your picture.
John,
The banking is evident in my photo, I didn't get more than 1/2 way up at 110 mph in 6S283.
Larry un-corked the side pipes and really opened up CSX2550, the 1st time I heard a small block cobra at full throttle,
I don't know what speed he hit on that track but he was really moving.
The only regret was XGT-3 was taken around at a leisurely pace, I would have loved hearing that 7 liters wide open,
I do remember it didn't like to idle under 2,000~2,500 rpm.
Thanks for the photos
jp