I haven't looked into any fast ratio parts as I have manual steering. I don't really need the killer pan but I had to replace a crappy stocker and wanted to upgrade the pan. I had the drag pan for another project so...

I might put one of those nuts on there, but I might just change the idler. I figure it is a CHEAP part if the maker didn't bother to drill it for a cotter.

The K bar bolts right in like your current one does, 4 large bolts. Somebody might chime in and tell you if the LCA's have a different tab location on the 70-up for the sway bar.

Watch for the welds to be busted around the LCA "tubes" in the K bar, will usually need weled up. Would be easy to do with it out on the ground. It would be worth checking your current K bar if you end up not changing it out as the almost always are busted out.