I converted my '67 3/4 ton to a 1/2 using a rusted out 71 GMC (sorry GMC guys). If I remember correctly, I used the A arms and spindles off of the 71 for the front susp. Also used the p/s stuff off of the 71 so I could get rid of the ram assist crap on mine. As far as the rear goes you will need to use the entire rearend and convert it to work with your coil springs. They make a kit to do so, but it does require some welding. After I did mine, it was like a new pickup.
kage