I'm am in the process of doing a 4" suspension lift on a 71 blazer. I have the back done and when I measured the front vs the back I have a 5.5" difference, but when I looked at my front springs they are not flat or curved down, but curved up about 2". Is this normal or are they just beat. The front springs have only 2 leaves. If they are not at the stock height I need to know so I can compensate when I order my front lift springs.