If you are looking for measurements, the AMA specs and Service Manual have heights. Unfortunately, they may be like the '68s and the numbers are significantly different between the two sources so it's like having two watches.
Perhaps someone here will have factory promo photos. I do not.
My ride height hasn't been modified. Original springs. I thought that they we sagging but based on that side view pic my ride height is very similar to that. Now keep in mind different rims and tires change the look. I now have 15x6 Rally IIs not the original 14" wheels. Not sure what the car in the picture is sporting. But either way the ride height is similar and my springs are original.
For what its worth I love my ride height. I think it looks perfect. One of the things I worried about was that it would go up if I replaced the springs. Figuring that mine is probably sagging. But now I am more hopeful.