I HAD ALL 4 COIL SPRINGS REPLACED ON MY 69 CHEVELLE. IT MAY BE HARD TO BELIEVE , BUT I NOTICED THAT THE RIGHT SIDE OF THE CAR SITS 3/4 ON AN INCH HIGHER. ONLY 3//4 OF AN INCH BUT I CAN NOTICED IT!!!!! WHAT HAPPENED?? SHOULD I HAVE MEASURED THE SPRING HEIGHT FIRST????
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did you make sure the spring was clocked into the seat correctly ??

Don't worry its quite common. See about the suggestion above or in my case the bushings needed to be replaced as they had oblonged their holes and made the car sit higher on one side than the other.

Good luck,
Joe