I have seen several ways to route, or not route, the coolant line that runs from the head to the water pump inlet, with or without a heater installed.
I have seen:
* the coolant pump port capped.
* the coolant pump port run to an elevated header tank (with a top radiator bleeder line run to the tank)
*The head coolant outlet port run to the coolant pump without a heater in between.
I am very interested in learning what has worked for you guys.
As for my car the ports are capped but I'm not opposed to doing something with that head coolant flow if it improves cooling.
No, I'm not installing a heater.