408 cooling issues

I also forgot to mention that I drilled a couple of holes in the shroud and installed a couple of rubber flaps that open at speed allowing more air to pass through the radiator. They were cheap to buy and came 4 in a pack. I am considering installing the other 2 just to see if I can keep it at 190° all of the time.
This will help on the highway only. It could cause some increased temps in traffic if they don't seal just right.