No, you won't blow a head gasket at that temp. Some race motors get that hot and hotter in some cases. Air cooled motors get quite a bit hotter than that. Granted those motors have the best parts, but if you use quality gaskets it won't be a problem. The weakest part of high heat is the oil or coolant, but oils and coolants today are so much better than they were that this not an issue now if you use the "good" stuff.