(Stock springs) Out of all the real street setups my buddy in Philly is running stock springs with 3/4 of a coil removed from the rear with one Air Bag and it runs consistent 1.30-1.32 60ft. No anti-roll bar no trick suspension stuff just old school shit we learned from the old fox body days.
Grnenvy, what air bag does he use? I'm not familiar with air bags that fit the S197 springs.
The issue with air bags is occasionally they cause unloading of the tires on a track surface that is really good. I don't view air bags as much different than running an old school drag spring with different rates side to side.
OEM springs can work really well.
I usually recommend a 27-28" ride height, with our suspension pieces.