1965 dart gt spring question

I've seen many threads in this forum and many people recommending this kind of spacer, specifically for ss springs. After digging into it I found out that it was a common thing for drag cars years ago to correct the angle of the shackle with ss springs. As far as doing it right, I don't see a difference in spacing the shackle mount and spacing the front mount, expect for the fact that spacing the shackle mount doesn't change the driveline angle, which is why I didn't space the front. I suppose I could have got new springs for the car, but there is no guarantee that I won't have the same problem with another lift spring.