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I just did it. 70 cab on a 79 blazer frame. Not all that hard. Took the mounts off of both frames. used the 70 mounts on the 79 frame. I had to redrill the rear mount hole in the cab, about an 1 out more since the frame is wider.
Pics here http://www.pnkages.com/gallery/v/79Blazer/body+swap/
None of the mounts themselves tho.
Is the '80 frame a pickup? That could make it more difficult. These frames ramp up toward the back of the cab... the rear cab mounts are flush with the top of the frame, and a good 3-4" higher than the front ones.
(I'm sizing up a '66 cab to go on a '83 frame so I've done the measuring )