The routing of the heater hoses was done years ago,by me,and I found it easiest to install the water valve in the upper hose that comes from intake manifold. Some old info might show the hoses reversed,not sure. Ford shop manual should show that info in cooling system section.
That paper “OK” sticker came from some new car I serviced for delivery back late 80’s. Not original,but looks the part....Dearborn car.