We carry both the small & big block V8 aftermarket power steering brackets for these trucks that allow you to mount the power steering bracket in the original location low on the drivers side below the alterntor using a short water pump
They are part # 2220456 for the small block V8 motors $49.95 a set and you can find them near the bottom of the page on the following page of our web site
http://www.gmcpauls.com/steering2.htm
If you are looking for a original stock version shoot me a email at
Paul@GMCPauls.com
and I'll look through my extra parts to see if I can locate a complete set as I think I have 1-2 extras. If I have some still I sell the used original brackets for $60.00 a set + shipping.
GMCPaul