To abbreviate a long story, the kludged in squarebody radiator failed when I was replacing a cracked hose. I actively disliked it, but couldn't convince myself to replace it since it was working.
I picked up one of the mid-priced radiators off ebay to replace it. The box came with my new favorite warning label.
I decided that my super legit original overflow tank needed a new home, so I picked up one of the universal ones that Otto recommended. I am quite pleased with how it tucks up into the inner fender.
Overall, getting this in was the highlight of my month. The rest of the new hoses should be here Thursday so I can hook it up and refill it.