I was planning a similar swap using a 71 dana 44 under my 3100. My plan was to use all the 4x4 specific stuff from the K10 that axle came out of(steering included) eventually I decided to swap to a blazer frame so I ended up selling all those parts off. It’s been 15 years ago now so I don’t remember specifics but I don’t know why it wouldn’t work? This link may help you out. I kinda wish I had done it this way these days.
http://67-72chevytrucks.com/vboard/s...d.php?t=233305
Great looking truck by the way!