I'd suggest using the appropriate labels template (from Tools>Letters & Mailings>Envelopes & Labels>Options) and carefully positioning text formfields into the labels (table cells), so they're positioned where the content needs to appear on the pre-printed stock, then protecting the document for forms. That way, you don't need the scanned image to be in the document and content can only be input in the formfields.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]