Hey! I see you're from Lynden! I worked at the Safeway there while attending college at WWU 2002 - 2006. Small world. Good luck with your project!
Also, if it's a GMC frame, the VIN won't be on it. For some reason GMC didn't stamp VINs on the frames for 60-66. Someone correct me if I'm wrong. Source:
http://6066gmcguy.com/VinNumber.html