Good luck with that radiator! I hope you are able to put in a new Overflow nipple on without too much trouble
I think I shook that magic 8 ball just right to squeeze another drop of luck out....
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I don't dare more than look at it, but it looks like it's in there. I can't find my JB weld or I'd slather it. We'll see how it goes, fingers crossed.
It's actually a transmission cooler fitting from the old aluminum radiator. I was able to swage the hole ever so slightly with a tapered punch, then start an 1/8npt tap in the hole. Just BARELY started it and snugged the fitting down.