As Colin suggested, it would be wise if you specified "operational fighter speed in level flight." This would have prevented all the supersonic dive legends that have appeared in response to your question.
I believe NKP S2 was correct. It was the P-47M interceptor version of the Thunderbolt. The P-51H was not as fast and didn't see service in WWII.
Glenn-Had you posted a shot of a Sea Fury the shameless plug would have worked for me. Is that wide-and-slow thing you posted related to the Provost, or are you going to tell me the Australians made that many mistakes on one design?