Yes. Mike thanks that link. I have not seen it before either.
Your help cracked the door open on the 2 page article I posted. I didn't know the magazine it was in, but searched the header name and found it!
It was in Esquire magazine, noted as May 1, 1964. I found a larger image of those pages and with it I could see the text.
Here's the larger images of the early Mustang concepts from the new jpeg I was able to save. I'd still like to find larger versions of these sketches, but at least now I can see them.
This first one you helped to find a larger photo of. It was named the Ford Median, as a smaller T-Bird style.
I haven't found any full size clay models of it, but I think it evolved into the Stilletto design.