Something interesting. Take a look at a Jeep 4.0, they have their CTS in the thermostat housing. BUT, the outlet for the heater core is also on the t-stat housing, and that is the part of the housing...

I have mine in a "T" coming off the rear of the intake going into my heater core. It has been there since I first switched to fuel injection. Its been there with my old 7747, and my current 7427....