correct and incorrect.
Lows sit roughly FE2 height, so about the same as an SS or HSV.
Superlows are an inch lower then that roughly, but you do not need shortened shocks. they are recommended, not needed.
This is a huge thread dig but I'm sick and tired of reading garbage so I'm going to give my opinion on the matter. Take it for what you will but I fit springs on a regular basis at work and have done testing to my own car before acquiring such job.
King spring SL WILL require a shortened/stiff shock, it doesn't matter what anyone says. The spring is too low and brand new monroe GT gas reflex struts will make the car nose down too hard and dive up. This will give you poor braking and poor take off.
Fit Monroe gt sport or equivalent struts/shocks to the car with a stiffer travel and the car will ride far better. The nosing over on braking conditions is so dangerous. Coming up a driveway and the car will just bounce several times and feel like utter crap.