If that's an RS2000 DOHC engine then point (B) is the heater feed. (heater return is the stub pipe above the water pump housing in the block.)
You may need to put in a restricter at outlet (B) and connect the hose from the stub above the water pump to (B) and (C).
Connect (A) to (D) as position (A) is the degas point. Be
very careful with this connetion on the thermostat housing as they get pretty brittle and there are no Ford spares left
well there wern't in 2003 when I needed one
Connect the small hose connection at or near top of Radiator to (E).
There is no overflow with this type of header tank as it's a sealed system.
BV.
