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My GT350 consistently ran cooler than the numbers you list above. Head temp ran around 200 and oil temp rarely broke 190. I didn't know any better so didn't think much of it. Then after a night at the drag strip the temps dropped noticeably. Cylinder head temp was about 170 and oil temp about 180. The car ran like this for two days, then the 'Check Engine' light came on. The light stayed on for two days over the weekend so I took it in. The dealer verified the codes, then replaced the thermostat and temp sensor. In hindsight, the temp sensor was probably fine. The thermostat had failed open (or at least open farther than it needed to be). Since getting the car back, cylinder head temp is in the 215 - 220 range, with oil temp around 210. Those temps vary depending on speed and ambient temperature, but represent the 'norm' for the car now.
 
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