Any idea how lowered this is?

[chappys4life]

I just recently picked up a 79 suburban and I knew it was lowered but trying to figured out how much. Also to me it doesnt look like its drop spindles, I am confused because it rides really good for sitting so low.

Here are some pictures of the stance and spindles. Right now it has 245/45r20 tires on it (need to figure out offset and width so I can order a spare, any chance it would be labelled on the inside?)