with all the coverage I've seen and shared of the recent MCACN, I thought it had been well covered. Nope. Here's Old Car Weekly showing a lot of cars that no one else did

placed 3rd at 12 hours of Sebring in 1966

Rocky Mountain purple, I posted about these years ago, https://justacarguy.blogspot.com/2018/01/the-rocky-mountain-insurance-company.html an insurance company painted them this eye catching color, and gave them to it's insurance salesman as company cars to increase the salesman's interaction with possible customers, as a lot of people will stop and talk to someone with an interesting car

the 487" stroked hemi GTX that was street racing in Detroit, and pulled a 10 1/2 second quarter mile. The engineers at Plymouth used it as a development mule after work on Woodward Ave

http://www.silverbulletgtx.com/history/bullet.html

or read Car Craft's write up (good one!) and full gallery http://www.carcraft.com/featuredvehicles/906_1967_plymouth_belvedere_gtx/index.html