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The maximum core temperature is listed as 110 degrees C, though you really wouldn't want it anywhere near there for long. I got temperature readings from the core sensor (which isn't very accurate) of around 75 degrees before it started crashing. That corresponded to a chip surface temperature of around 60 degrees (without a heatsink but with the small fan blowing over it). A small heatsink (+ fan) brought those down to around 52 and 33 degrees respectively, and the large heatsink in the photo there (+ fan) brought them down again to about 45 and 30 degrees. So your figures aren't that far off.
The CPLDs will get very hot at high speeds, and I suspect the crashes are as much to do with them as the CPU itself. But if you're getting crashes, it's probably too hot and you should pull things back a bit.
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