[Duvall]

I am trying to figure out if a 67-72 truck body will fit on any other year frames.
I purchased a 72 basket case k20. Not real happy with the condition of the frame. Will a 73-to 87 frame fit? I have tried to find info but only found a couple threads and they say the early body won't fit correctly on the newer frame.
Any help would be greatly appreciated.