Rusty - Just a quick thought, but you are probably on target for the 8 77 being a possible date code.
I’ve got a guy I’ve known for years that runs a Firestone shop. I’ll reach out and see if he can help with the ID and get back to you.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
