Since your conversion was for a C10 and the subject of this discussion is a C20 there could very well be some differences.
However, it sounds like a great opportunity for you to write up a "Tech Tip" for the bolt in conversion of a 97 Suburban rear end with suspension to 60's C10 and C20 trucks. I'm sure there are lots of owners of these trucks that would be interested in a detailed description of the parts needed and the processes involved.
Fred
You have a point, because the C10 has trailing arms. The C20 might just have full leafs, but I'd imagine as long as the axle tubes are the same size you could unbolt one and bolt in the other.
I did the conversion in 06 and never took pictures so a write up would be difficult to understand. But after swapping transmissions back and forth (causing me to cut out then reinstall the transmission crossmember) and try to change a ring and pinion, swapping the entire axle in a couple of hours was a dream.
Not to mention I put new brakes on the rear end in March, and parts were much easier to find.