Serial #44-64005, C/N 122-31731
This aircraft is a P-51D-20NA registered as N-6339T owned by Bob Bleeg in the 70's I think. Also served in the Canadian Air Force as RCAF 9561 according to "Mustang Survivors". Other identities N-51CK, and is now N-51WB, is owned and flown by Charles S. Kemp. The name on the nose is "Joanne".
Found pictures of the aircraft in a Japanese magazine that has an article on racing Mustangs by Syoichi Tanaka, photos supplied by Jim Larson. The barely visible design on the tail is a rearing Mustang in gold.
This appears to be the same Mustang that has belonged to Charles Kemp of Mississippi. If I am correct ,it was owned by Bob Bleeg in either the late 1960's and/or the early 1970's. I think it was based in Seattle , WA during that time if this is the same aircraft.