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I kind of wonder if the core is good anymore. If I ever do decide to put it back in use I'll find out.

I never capped the ports in the core. I used a plug in the pump on the return and tapped the discharge and put a plug in that. I think it was 1/4 NPT

That's what I did. Just pull the heater hoses and plug the ports.

Probably not. A fan is of little or no value to the cooling system when going down the road. Unless the fan can draw air through the radiator faster than a 70 mph head wind. The usual culprit is a forty year old radiator that doesn't flow like a new one. Followed by thermostat, timing, a/f...

Any chance that you're running lean?