It's just a morph'd up truck. I was able to go look at it again after work. The owner maintains it's a chevy and I didn't argue with him, but apparently someone must have put a chevy cab and front clip on a GMC 1/2 ton frame. The axles are 5 lug, and it's definitly a long bed. Wierd, but like frank50 said, a lot can happen in 50 years. I appreciate all the help and response guys.
