John von Linsowe, a Delphi employee who happens to be a pilot and an amateur photographer, has chronicled the demolition of the old AC Spark Plug plant. A booklet of the photos is available on eBay for $29.95. Included are extra aerial photos of other General Motors facilities demolished in the Flint area. It's 40 pages of 5" x 7" high-resolution photographs. That price seems a little steep but he seems like a nice guy, and he did fly around in a plane and everything.
Here's a more uplifting image of the old AC from Lori Wenzel.