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About the heater core hose. That is a return from the core, to the engine (via the inlet on the intake). The water is pumped from the water pump, through the hose on the passenger side into the core, from the core to the back of the engine, through the engine back up to the pump. Most cars have the heater core flow control valve on that hose you are referring to so that it can stop the flow of heated coolant, thereby controlling how hot the core will get. Of course, the coolant will also flow through the block itself as well. I don't know if having a smaller ID nipple on that inlet will reduce flow or just increase the pressure of the coolant entering the back of the block.
About the overheating issue. It seems as though you are getting a handle on it, let us know what transpires, alright?
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Dan
'46 2 door
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