That 60s 12 lug would have been the first choice for my swap.
Kept an eye out for a while and the ones that were nearby were too much money. The deals were farther than I wanted to travel. This other 55.2 rear end just kinda fell in my lap and I decided to give it a try.
Those 63-69ish C10 6 lug 12 bolts are also OLD. But they carry the advantage of having widely available and affordable replacement parts. And a wide range of gear ratiosz