Suggestions were correct. Ordered a heater core and two o rings from FCP Groton, they went in this afternoon in about 2 hours start to finish, including a coolant flush.
I could see the evidence of leaking on the old core, all along the top side. It appeared to be slowly dripping, and there was also evidence of dripping on the bottom of the housing and out under the carpet on either side. Luckily it wasn't much, and was cleaned up easily.
The local shop was going to charge 4 hours of labor, so I saved a bunch of dough and finished quicker than them! Thanks guys!
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