Welcome (sadly) to the Funny Farm !!!:highfive:
I'll move this to Engines, Northstar - you'll get more varied input there.
Please read the several stickys on the main Northstar forums page. Cooling fans, cooling system, gauge operation. head gasket and repairs.
You have the classic symptoms of a bad gasket caused by failure of the cylinder block head bolt hole threads in one or more bolt holes.