Not sure if this helps the effort at all, but after digging through all of my doubles, I found miscuts of both versions of #517. Unfortunately, they each only show a tiny, tiny bit of an adjoining card, but who knows...
1966topps517wsoxA.jpg1966topps517wsoxB.jpg
1966topps517whitesoxA.jpg1966topps517whitesoxB.jpg
On the "White Sox" card, it is clearly beneath a rookies card with a light blue nameplate, or a team card.