When you say you changed some fluids, did you have the coolant out of it?
Did you get all the air out before starting it? These will not burp simply by filling the rad up, you need to remove the hose from the top of the cold start advance thermostat housing and slowly fill until coolant runs out.
Running with an air pocket will get one of these hot quickly and the HG is sensitive.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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