clutch fan

You really didn't give us any history on this problem. Did you just do this swap ? Did it ever run normal ? What do you consider hot ? 180 degrees, 200 degrees ? does it cool off back to "normal" when cruising over 40 mph ? Rear end gearing ? 3.23 ? 4.11 ? Coolant type and mixture. 50/50 ? Radiator cap tested ? 16 lb. ? As mentioned before, tuned properly ? All of these things can affect coolant temp.