if it over heats that quick you for sure have a problem. how about
also checking you thermostat to see if it is stuck , etc..

obvious if it is running hot then something must be restricting the flow of coolant...let us know when you find the problem

appears you have done a lot of work so might be something within what you did...

like Jerry said, could be your gauge.. or how hot is hot like he asked

Redryder pix
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