As original as possible, put your original springs back on. I "think" they came with thin zinc sheets between the leaves (prevents corrosion) and I believe those are reproduced now. You could always call ESPO or another spring manufacturer or my Dr.Diff for advice too.

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"