I've had good luck with re-cored original radiators. Not cheap to have done though. I figure if they were good enough for the originals they should still be good enough.
You didn't mention any temps ... so not sure what you might be considering too hot, or good. Bear in mind the smallish OEM radiators used in 65 required suitable temperature difference between air and coolant to work properly, so running a thermostat of the same rating as OEM would be important.
Meaning it's quite possible the OEM size radiator is not capable of maintaining the temp you desire, but is able to maintain whatever the OEM spec for temp is.
If your system does not maintain the OEM specified temp, THEN you have a "problem" ... if your system does not maintain 160 or 170 degrees you may NOT have a problem, you just have a system that was not designed to run at that low a temperature.
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