After thinking about it, it was not a 67 but a 66. I did a search and came up with a 67 GTO in a Cadillac green and also a 66 in a Cadillac green.
Here is an article on the 67. If you do a search for 66 GTO in Inverness Green a pic will come up. It's a Facebook thing so I can't link it here but the motor trend article shows some good pictures of the 67. Both colors are very similar and they give the codes.
https://www.motortrend.com/features/...-time-capsule/