some info here on doing a power steering set up. usually with a v8 but that is secondary
https://67-72chevytrucks.com/vboard/...d.php?t=835408
here is a thread where the fella uses a saginaw box mounter outside the frame
http://67-72chevytrucks.com/vboard/s...power+steering
here is one that shows the cpp style kit mounted inside the frame. scroll down a few posts to find the pics of the steering
https://www.trifive.com/threads/prou....226040/page-2
here is a thread on options for an automatic
https://www.jalopyjournal.com/forum/...ptions.629855/
hope that helps