Bisett, from what I have read it is not the best frame to use for a pickup swap since it rises up in the bed area. There are a few threads that address this, as well as a bunch of others that have a lot of info. Here is a partial list of threads I'm subscribed to. Sorry to those who are not listed, but I subscribe to about 30 and don't want to overwhelm this thread. These are the most recent with posts...
For the 117" wheelbase, most have gone with the regular cab longbed when using an S10 chassis.
http://67-72chevytrucks.com/vboard/s...d.php?t=632686
http://67-72chevytrucks.com/vboard/s...d.php?t=562572
http://67-72chevytrucks.com/vboard/s...d.php?t=531261
http://67-72chevytrucks.com/vboard/s...d.php?t=676497
http://67-72chevytrucks.com/vboard/s...d.php?t=609082
http://67-72chevytrucks.com/vboard/s...d.php?t=384736
http://67-72chevytrucks.com/vboard/s...d.php?t=642010
http://67-72chevytrucks.com/vboard/s...d.php?t=651164