I took my 715 radiator in to the local shop, and was told the core was failing, and a re-core would cost over $500. After digging around a little while, the shop owner found a new one for $350. It's on the left:
Jason (the proprietor) told me it listed for a 1965 Ford. He couldn't remember the model. Anyway, it's 1/2" wider, with the same height, hose fitting placement, and core count. The outlet fitting is larger, though, and the mounting bracket is different.
I'll update when I get it installed & see how it fits.