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You might not be running hot at all. However driving the car at 63 might be pushing it a bit and causing things to warm up.
The fan belt should not be super tight. Just enough tension to turn the generator and the fan/water pump.
Adding a couple of quarts of coolant after each drive is very common if the radiator has been filled too full.
You need to leave room in the radiator for expansion of the coolant as it gets hot. Model A's don't like to be filled to the top. Instead drive the car and keep an eye on the coolant level. Allow it to puke coolant out and don't add any back into it. As long as the coolant level stays above the tubes in the radiator it will be fine.
Resist the urge to put coolant back in. Let the car find the level of coolant it is comfortable with.
Buy a cheap dial meat thermometer and use it to check the temperature of the coolant directly. That way you will know for sure if the engine is running too hot. The radiators on Model A's are not pressurized so you can take the cap off and check the temperature multiple times during a drive.
It is also possible that you have a head gasket that is leaking and it will let gasses into the cooling system pushing coolant out. With the cap off look into the coolant while the engine is running and look for bubbles. If you see bubbles you will need to torque the head. Probably a good idea to check the torque anyway.
Have your friend purchase the Les Andrews Volume 1 book. This will be a great resource for maintaining the car.
If after checking things over and it is actually running hot one of the next things to be looking at would be the timing.