I didn't know overheating the center exhaust ports was an issue on Mopar engines? Are you already running a high-flow water pump and 180-degree thermostat?
Electric water pump, no t stat just a restrictor. Its not an overheating issue so much as it is a hot spot. The center 2 cylinders will generally run a little hotter than the end 2 cylinders, combine that with forced induction and a single point fuel source, it can cause problems when you start leaning on it.