Run a thermostat. Remove the flex pin and drill its opening to 1/8 or so. Automakers have been putting thermostats in for ever and they rarely fail. 180 degree
Agree with this 100% but we are Northerners, and you are fast enough (and I was once fast enough) to be in clean air much of the time. The "gutted thermostat" was the coldest running thing I tested, and I tested engine cooling (air and water) on 1.6 and NB as much as I could, including bombing down country roads at 100mph in the Wifemobile mint low-mile Green/Tan '99 with OBD-2 logging and thermocouples and a Magnehelic duct taped to the windshield testing 8 combinations of stock inner fender liners and various taped up grill openings.
If you can stay below timing retard (204-207F as read by the ECU depending on year, IIRC, but botched Autometer installs could be 20 degrees off), I would run a thermostat every time as Novak says. But if you are running hotter than 200F on a given weekend, rip off the "chicken wire", seal up all the air gaps around the radiator, run a "gutted" thermostat … and then re-evaluate your entire cooling system after you have retubbed the car because of a bad pass for 12th.