Dart Running Hot?

I was having temp issues when running the A/C, I believe the culprit was the March Performance pulleys I have on the motor. Despite the claims from March Performance (they said they didn't ever make an underdrive setup for the LA) the water pump pulley was about an inch bigger than the crankshaft pulley, i.e. underdriven. So I bought a new water pump from FlowKooler and it runs just fine now. See if your pulleys are underdriven and whether you have the A/C or non-A/C waterpump.