Re: How RARE is this Chevelle?
I totally dig unusual cars, and this is one of them. It's more of a wild match, rather than a mismatch, as red goes with a lot of colors.
For example, if you know what a 1971 GT-37 is, it was available with two sets of stripes: red/white or red/black. This tells me red goes with just about everything.
The 1969 Road Runner had a stripe that was only available in white or red. The same year GTX had a lower body stripe in one of the two same colors.
This is not the first yellow/red car I've seen. In fact, there's never a way to claim "1 of 1" because when you look at cars that have production info (like Ford, courtesy of Marti), you'll see there are records of some unusual combinations in numbers greater than 1. Whether they were ordered or factory goofs, I dunno, but I don't feel any claims can be made without docs.
So I think red complements the yellow nicely. Where it starts to be problematic is that some people don't like Sunfire Yellow, but I do. I'd really hate for someone to change the combo, even if it is simply a matter of repaint.