It's been my observation that we get used to seeing cars with "worn" springs sit lower, so we don't really realize just how "low" they've become. When Eaton Spring returned to prominence as a coil spring choice, using factory blueprints, most of the cars which got those springs looked "too high" to me. But when looking at printed pictures in brochures for those cars when new, the "too high" was really "correct" ride height.
There also seemed to be a relationship between the bottom of the rocker panel and the center of the wheels, with them being pretty much "in line" with each other, front to back. Some "artwork" printed ads tended to distort the ride height, making it lower as the cars seemed to be depicted "longer" at the same time. Looked nice, but with obviously decreased ground clearance and suspension travel. And, of course, tended to accent the styling of that era.
Also remember that "ride height" can also be affected by the tire size/height. What might look good with a G78-15, might appear "too low" with a J78-15 as the wheel well was more filled with the larger diameter tire, as the car was physically a bit taller with the taller tire, too.
The car looks good as it is.
CBODY67