Man,you have just about exactly what I have:

Mine was a C/20 CustomDeluxe CustomCamper Highlander big block and is set on an original`72 K/20 chassis that was a beat truck.First tasks were brakes,bearings,u-joints,springs,shocks,ball joints,clutch...Now it`s a mechanically sound all original paint high optioned K/20.I kinda hate to restore mine.I feel unique runnin`around my area in a classic with the "just another truck" attitude.
I have another original K/20 that`s gotten rough since`91 when it came from Califiornia:`72 K/20,CheyenneSuper CustomCamper loaded.It has high resto value,but can`t get any interest or appreciation.So,I hate to do it,but I`m thinking about doing the same with it.I could sell-off the original body parts that are good for some dough to go towards a clean-bodied 2wd.