No the rear shackle isn't supposed to be moved. At full droop, the stock shackle should be straight down, so on compression it can only move backwards. It sounds like you were shipped the wrong springs.
If you got them used, you will need to get a longer main leaf made to replace the main in the Procomp pack.
-------------------- More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed
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