over cooling

my 340 is currently experiencing an overcooling problem. the block and heads was media blasted and has a heavy duty water pump, a new radiator, 185 degree thermostat, and a fixed 18" blade fan plus shroud. would a thermostatic fan clutch help my car heat up to operational temp faster without having to load the transmission to heat the motor? I am running at 140 degrees on an average 70ish degree day and about 150 degrees on a 95 degree day with no traffic traveling at 50mph