Craig,
Here in the fall, the daytime temps are in the 70s usually and my Cobra temp runs around 170-180. After installing the HD radiator but before the turbos it wouldn't heat up at all - 140-160 even though I am running a 180 thermostat.
If I get on it for a while and run it hard the temp might see 190, but the electric puller fan comes on at 175, so it rarely gets above 190. Maybe if I was running on a road course for an extended period of time it would get warmer but I think I will be ok in the summer.
Hard to run that thing too hard on the street as it just goes too darn much. I try to save it for the drag strip, but ...well, you know.
Later,
Mike