Carribean Coral:
1) The 49/50 color is not quite the same as the 51 color.
2) The paint chips I have seen listed the color as a "factory mixed" color meaning the paint came mixed from the paint company and the local jobber could not mix it because they didn't have the mixing colors.
3) Yes, it does fade out. On my 51 Deluxe, the body turned brown while the package tray turned silver.
4) I had even started painting my car an easier color (a 1976 Dodge metallic Rust color) but really, the paint choice is important to a KF product. KF couldn't offer engineering innovations like the Big 3, but they could be innovative with the paint and upholstery.
5) I watched cars on the highway for over 2 years trying to get an idea for a later color that could be mixed by a local jobber. I finally settled on a 1976 Cadillac color - Fire Mist Chermise. I made the match based on the back of 2 1951 instrument clusters.
6) When you paint your car, don't expect total agreement on the fidelity of the color. As an example, at the Burlington KF National, there were 5 53 Dragons that were painted velvet Maroon. In the noon day sun, 2 of the cars matched what I thought the color should be and matched each other very well. 1 was a little off but the worst looked like it had a good shot of brown in it.