Always a good idea to check that (pinion-angle) whenever you mess with the springs and ride-height.

If a problem (angle) is detected, you can often fix/adjust with wedge-shims unless it is excessive, in which case you'd need to cut-off/weld-on new spring perch pads onto the rear-axle housing.

Here is some info on checking D/S angles:

http://www.streetrodderweb.com/tech/0203sr_drive_shaft_angles/index.html