Thank you! jmccully for posting that link.
That's what we hoped would happen when we did the project.
Krazy Ray, Your Vin will decode using the first decoder in the link above. That's the one for a 1967 GMC.
As far as the 8 with a triangle, That is normal as I have seen a lot of them like that. Here is one as a example.
Here is the 1967 GMC Decoder