Stuck stat as stated but many exhaust bolts on that year 318 go in to water jacket Good possibility you also had a air pocket driving things every where coolant wise. By the way don't stick to that 36 total give the engine what it needs but watch the initial timing you don't want it over 25 degrees if possible. Pressure tester held for more then 5 minutes go and run and see what happens just don't fry it