my 1989 chevy coil springs need replaced on my chassis p30

I also have coil spring suspension (P-30) with the mor ryde tag set up. No question, air bags added to the drive axle will enhance the performance with an ability to; level, and adjust with full tanks. I used Firestone Ride Rite air bags for the rear, a little tricky for clearance, make sure they don't rub or have the possibility of coming in contact with an abrasive surface.