The plumbing on my WCC is bone simple.
There's an electric water pump mounted low at the bottom of the radiator.
Twin -16 lines run from the pump to the face of the block.
The water comes out of the thermostat housing/filler neck (modified gessford piece) and back into the radiator. This is the high point. There is a 5/16 hose from this to an overflow/recovery tank.
That's it. No "cobra" expansion tank, or anything like it.
The only other thing is the two 1/4" lines that run from the back of the heads and bypass the thermostat...simply to remove trapped air and allow me to fully burp the system before even starting the engine.
A picture may be helpful here...
