340 coolant trouble

What temp is it running? If the top hose is hot and the bottom is cold that's normal. The top hose can't get hot unless the coolant is circulating. The top hose is the inlet to the radiator from the engine so naturally it's the hotter running hose. The bottom hose is the outlet to the engine so it's coolant that's ran through the radiator which has been cooled.

The coolant moves slow through the radiator on my Cuda also but it never even somes close to overheating.