I just got one of these in the mail and it should be in every AD truck owner/builder's resource library as it will get referred to often no matter if your truck is a full showroom restoration or a full custom on a different chassis there is something for everyone.
http://www.ebay.com/itm/CHEVROLET-19...item43a0f4f38e
I also got one of these a while back and although it is actually a 54 manual it works pretty well for the earlier AD trucks and really works great if you are changing body panels and need to know where spot welds and what not are. It also gives good instructions and diagrams on mounting the cab to the frame.
http://www.ebay.com/itm/Chevrolet-Pi...33aff9&vxp=mtr