You can buy a '28 - '31 perimeter frame, with just front and rear cross members pretty cheap from TCI, $729. Why screw around with a worn out S10 that may have been in one or more major accidents or rusty.

http://www.totalcostinvolved.com/pro...fm?prodID=1071

Or as rumrumm say, build your own, but only if you have good welding skills.