Hey D&W, your '68 is going to kick ass when you drop it. I just cut the springs on mine, it's probably been about 20 yrs so I don't remember how many coils I cut. I know it went down more than 4". You could probably start with 2 1/2 coils and go from there. The ride is as smooth as stock height and it still has some suspension travel, stock shocks too. Later.