Took a closer look... I can post pics later- don't have access to flickr right now..
The top metal piece toward the front of the core support was not trimmed believe it or not... its a very smooth cut and actually has a contour in two spots that match up to the top radiator tank.
I'm thinking maybe it is from an early AD GMC?
Either way it's in good shape so unless I find out that it's some rare piece ic an sell and buy a Chevy version, it's going back in...
