Duster Survivor Radiator Dilemma

Motorad makes the fail safe thermostat. Found that at Rockauto.

This seems like a good opportunity to change the water pump. What do you all think? Rockauto lists a bunch of water pumps for my 1974 Duster 318, including HD ones and ones for use with AC. (My car does not have AC.) Any recommendations for a water pump?

Thanks.