Had a good little chat with the original owner again today. I sent him some pictures of the car and he thanked me for reminding him of his youth, and for mentioning him on the show card. He then sent me a text with this image attached. He told me that this was the license plate he had on the car when he returned to Texas with the Z/28 back in 1970.
Kinda fitting for the Day 2 car it was back then. I'm totally diggin it'