Reply to "Did new ac system instead of Atomic throttle body fuel injection"

You could purchase a new thermostat housing that has a fitting for a temperature sensor if MSD requires a second temperature sensor for the radiator fans. I had one that was for a 429 Ford and it fit on my Cleveland block. I don't see why it would be that important to have it mounted in the block if all it was going to do is turn your cooling fans on, which in a stock Pantera are activated by the temperature sensors in the radiator.  Any of these aftermarket EFI systems want to have an accurate water temperature indication to determine when the ECU goes from open loop to closed loop operation. The water temperature sensor will also control the warm up fuel air ratio mixture. Welding the bung into the exhaust is common for any system that I know of unless it is some racing set up. I am using a F.A.S.T 2.05 system which is port injected, but I know of a couple of people that have the MSD Atomic and they like it. If you use the water temperature sensor port in your block for the EFI coolant temperature, you are going to have to find another place to get you water temperature gauge indication from. The original Pantera surge tank sensor location wasn't the best place to take that reading from, but if you put that sensor in your water pump, then your gauge will read lower than your actual water temperature is.