john, out of curiosity, at the lower end of your grille shell, do you have a metal "scoop" like the factory shell had ? this aids airflow to not bypass the radiator by going under the car if the "scoop" was not there. just a thought. also, please refresh me on your fan setup. as my old man was fond of saying, : "he [i] don't know he [i] left the house yet !"........ "oldtimers" ya know.....

upon looking at your pic, try adding a "scoop" from the lower edge of your shell up to your front crossmember, closing that area, forcing more air to flow through your radiator. see, i looked and didn't see ! i hate when i do that.....