Oh, quite simple really. I have always loved the civilian painted Mustangs, and N5466V was one of the earlier ones I ever saw photos/ film of. Around 1985-86 I borrowed a videotape with several 1970s aviation documentaries and TV specials on it, and there was #76 making a pass in front of the cameras. I just fell in love with the Maroon P-51 right away. I didn't know which one it was, or even if it was still around until getting Tegler's Reno book sometime later. There was a photo of it in the book, and a quick glance in Coggan's Mustang Survivors showed it to be extant.
I later contacted owner Dave Norland in the hope of seeing it if I made it to the US. The plan was to visit Denver in 1990 while the Air Races were in town, but sadly it didn't happen. When I did pass through Denver a couple of years later time was not on my side and Dave and I didn't get to meet. Sad thing is, while Dave owned it for some 30 years, it was only flyable for about 8. Long story short, Dave later moved, the plane went into restoration in FL before being sold, and I never got to see the Maroon racer...

Here is a link to a tribute to Dave Norland with a photo of him in #76 back in 1973.
http://fal-1.tripod.com/Dave_Norland.html
T J