Not to sound too basic, but what shape is the thermostate in and is it in properly? I have seen them placed in up-side down before. I'd check it or replace it, be certain of proper temp for thermostate
Thanks,
Tom
Also note that if the block or head has cracks between the water jackets it can still overheat. If the engine has ever had radiator stop leak added to it, it may have blocked some of the coolant passeges. Maybe you have a faulty waterpump.
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