Thanks guys! For the reservoir the key is to make sure it is the highest point in the system. I made a shelf to position it higher in the trunk and below it I mounted a Mustang Cobra pump. Setting it up like this allows the system to self bleed off any trapped air and always guarantees the pump sees water:
This will eventually get redone to clean it up a bit. I've got the pump and heat x-changer fan wired to a switch to stop heat soak for any stop and go traffic situations. Ideally I'd like to set the switch to be triggered by the VSS and come on at xxmph. Trying to figure out the easiest way to do this.