Lots of stuff to consider when removing the body.
One thing to be sure of...
body is braced in some way [supports welded in to reduce/eliminate body flex] - if the body is pretty solid - it might not be an issue.
Do a search for 'removing blazer body' in the search section up top. Here is a post that is pretty recent:
http://67-72chevytrucks.com/vboard/s...d.php?t=370937