Pasadenahotrod is right. The Stovebolt forum has had several discussions on this swap and no one over there thinks its a good idea for a couple of reasons. First the S-10 chassis is too narrow and too long, and second the kickup of the rear frame makes the stock bed almost unusable. Keeping in mind that those guys are pretty knowledgable about these trucks that should tell you something. However the majority of them prefer restored trucks so their may be some bias in that direction too.
One thing I've read everywhere on this swap is that it isn't easy and is a lot of work. In your case you probably have no choice since the only frame you have is the S-10 that came with the cab. If you have to do this swap pick up the current issue of this magazine. <a href="http://www.classictrucksweb.com/toc/" target="_blank">http://www.classictrucksweb.com/toc/</a> There is an article on doing this same swap that should be of help to you.
From memory the stock wheelbase of your truck is 116" if it's a half ton and 125 1/2 if its a 3/4 ton. Track width (mounting surface to mounting surface) is in the 59"-60" range.
<a href="http://www.hotrodsandhemis.com" target="_blank">http://www.hotrodsandhemis.com</a>
[ April 23, 2003: Message edited by: Centerline ]</p>