On any car but especially Pontiacs you have to use the radiator shroud and the fan has to be 1/2 in and 1/2 out, a fan in front of a radiator is just going to spin air, it isn't going to pull it through the radiator without a shroud, if you have all this and still run that hot something is wrong, the engine has an issue or the water pump, Pontiac 400 should run 180-190 period