Richard Carpenter (from The Carpenters) is a big Mopar fan as well. Lot's of nice ones here. Mopar Heaven: Richard Carpenter’s Exotic Car Collection - ThrottleXtreme
I think the OP's was loose. THe clutches usually leak. THey should have some resistance when cold and pretty much free wheel when warmed up. When the thermostat spring get's hot, they will lock up.
Do you have a clutch fan and a shroud on it now? It should all be working properly and may help your a/c and heating up problems as long as all is well with your cooling system. I wouldn't condemn the pump until you check out the rest of the system.
Figure out what gear you need and then place a Parts wanted ad here for a used one. Brewer Performance and Mega Parts USA are a couple vendors that sell new ones.
What year is your transmission? It makes a difference.