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If you're talking about the shims that sit on top of the valve stems, no. Their purpose is to make sure that both valve stems are the same height so that the rocker arm is level which isn't affected by the rocker arms at all. The height of the rocker arm is controlled by the lash adjusters. If you're running solid lash adjusters, yes you should re-shim these while you are in there (really just a 'might-as-well' thing; you should be checking the lash periodically regardless). If you're running the stock hydraulic lash adjusters you don't have to do anything because the height is controlled automatically. That is, as long as you kept them upright the entire time. If they were ever in a position that wasn't standing upright you will have to bleed them before installation.
All of that being said, what exactly did this rebuild include? If you had your valves replaced/relapped/anything that involved removing them from the head, I would certainly re-shim because it is highly unlikely they are at the same height as they were before the rebuild.
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