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There has been some experiences that I have seen over the years with Model A owners that were similar to this. Where after you pull the head and clean out all of the internal water passages you can get to that when it is put back together it then overheats. Knocking the old rust and scale loose inside of these passages will find there way to the top of the radiator where they plug up the tubes.... Try a back flush of the radiator before you go into major panic mode over timing, leaking head gaskets, cracks, etc... One guy had a new radiator and was so sure it wasn't the radiator that he ended up replacing his entire engine only to find the exact same situation occuring. A simple back flush and everything was COOL.....