I have AVOS (I think, not sure modified by Rutherford) and the shock hoop as well as well greased 5 leaf springs in the rear. I have tried the Suplex Kit (Too Soft IMO) and MULFAB Kit w 140 inlb springs (too stiff IMO). Now recently changed to the blue +8 springs at I think 120 inlbs. Koni shocks but have used NO shocks with success in the past with the blue springs. Not very happy with any of this. Every time I drive my '63 +4, Original front springs, Koni's on 4 corners and Rutherford modified rear springs I marvel at the ride and handling of this old +4. Why can't I get My +8 even close to the the ride/handling of the +4?