Ah, Kroil... I've heard of that stuff before but never used it. Do they only sell directly, or is it on the shelf somewhere? Google shows AutoZone, but I don't recall seeing it there. Maybe I'll try that stuff and the Evaporust if I can find them both locally.

It crosses my mind to just free up the pins in the pistons, and sell them as assemblies for someone else to mess with. At least one rod is toast from a pitting perspective, so it isn't a drop-in set, even with some additional cleanup.