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I have never looked into swapping a later frame but from what bits and pieces I have seen posted it includes some major fab work. Here is a thread on the subject....
http://67-72chevytrucks.com/vboard/s...d.php?t=263140
and pictures in post #13 in this thread.
http://67-72chevytrucks.com/vboard/s...d.php?t=239942
As far as the '67-'72 pickup and suburban I know the body mounts are different and the suburban frame is longer in the rear and steps down.
Hopefully others will chime in with suggestions.
LockDoc