[30standardcoupe]

I have a 30 Coupe

I have installed a brand new leakless water pump, also had the radiator cleaned, & fixed by a reputable radiator shop, also purchased a brand new radiator cap (Making sure its a radiator cap and not a fuel cap). Also replaced both upper and lower hoses, and installed a Thermostat.
When the radiator was at the shop, I made sure that the baffle is in the radiator.

I have a water temp gauge installed.

Driving down the road, it runs right where its supposed to, but it still pushes antifreeze out the over flow.
Eventually, I have to add more antifreeze to the cooling system because it gets to low to cool.

Is this normal on Model A's? I know that you cannot fill it to the neck as when it gets hot, the coolant expands, and it's not a pressurized system.

So, my question is this: Those that drive their model A's is it common to have to fill the radiator over time? If so how many miles?

Or do I have another issue?

TIA
Clay