Steve, MMZ's info is very accurate... And you are very intuitive to seperate the cooling system for the IC / SC. It's going to be a pain in the neck to find a location for a seperate coolant tank though, since you are doing this to a daily driver and don't have the luxury of putting it inside the passenger compartment...

If I may make a suggestion that may help cool your charge air without the headache of replumbing...

First, the OEM heat exchanger is terribly inadequate... So you might want to think about upgrading that... Second, the IC is smack dab in the middle of the hottest part of the engine, without any insulation from the radiated heat... You may want to use some sort of heat insulation under and around the IC... Third, the coolant tubes into the IC are very thin walled aluminum which are also not insulated... These could be wrapped to limit absorbtion of the radiated heat from the engine bay...

If you do decide to install a seperate cooling tank and install the Johson pump, remember that the IC is inside an "OVEN" , the "V" of the engine block. So, you really do need to shield that from the radiated heat of the engine...

The OEM pump system is closed circuit, there is an overflow tube that "Y's" off the outlet tube of the IC into the radiator, but aside from that, the diagram in the previous posts are correct...