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sounds like a leaking head gasket to me. If you had machine shop surface the heads then there is your problem. If you are using the ford head gaskets then thats why the leak. Ask you tech to check for exhaust gasses in the cooling system, Having air in the coling system will cause the temp to move around a bit but only after intial startup, once warmed up and driven you can topp off the cooling system thru the tank.
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