Am brand new to the forum but thought I might answer this post which I came upon while looking for information about my truck. I have a 1965 Chevrolet C60 truck with the 409 engine and factory air. It started life as a flatbed, was changed to a wrecker, and then the boom and wrecker parts removed and converted to a fifth wheel hauler. Then it sat for 22 years unmoved and untouched. That's about where I am at the moment. Would be glad to post some photos but don't know how to do that in this context. Great site with big trucks near to my heart. Thank you.