What head should I get for a 318

In a perfect set up a 180 TS would work fine, but in the summer if I leave the 180 in most of the time the motor would run 195 or so and I would need to use the fan much more offen. Thats why I run a 160, the motor temp is about 180 most of the time after 10 mins or so. In the winter it cools off much better so the 160 is too cold. Hope this helps, oh I have no desire to spend $500 for a new aluminum rad and other $250 for a pair of fans - much cheaper for me just to swap TS 2 X a year, I throw enough cash away at the gas pumps :cussing: