Left Side (Drivers side facing driver) ? is a 3/4" water inlet/outlet for ? reason, not used in an F body............
The ? on the right side upper, is a screw in O ring aluminum cap that is where the coolant level sensor is supposed to go but does NOT fit, not even remotely close to being able to fit. So the cap had to go in and get tightened down and no coolant level sensor in the system at the moment.