Thanks for the compliments guys. No good taking pictures of airplanes like that if you can't share them with people who will appreciate them!
According to Mustangsmustangs.com this aircraft has the following history:
44-73973:
1951: RCAF as 9281
1957: N7325T (James Defuria) (Aero Ent.) (Peter Rossi) (Farnum Brown)
(Joseph Wade) (A. Lee) (James Gentle) (Wendell Trogden)
1969: San Salvador as FAS 407
1975: return US (Jack Flaherty) adopted 44-10755
N6325T, N35DD, N37FF, N51JC, C-GJCJ (Jerry Janes), N51JC
Still doesn't answer the question about the RAAF usage of the Mustang, but I think you answered that already, NS.