I'm pretty certain that's a custom paint job done locally, not a factory or dealer option. In the first pic, there's what looks to be a good four-eye grille on the 79 behind the RC. You found a nice little goldmine. There are a lot of good parts on that one. Spare tire carrier, roll bar, rear bumper, not to mention the 440. The top of the grille looks good, and it has what appears to be a factory push bar. I also spotted an uncut dash bezel with a factory tach or clock and vacuum and voltmeter gauges. The last pic also shows a 72-80 crew cab. Time to go shopping!