.tpz is "topaz," Amazon's special DRM'd format. In order to convert it to anything, it would need the DRM stripped (which it's against the rules at Mobileread to give you specific instructions for, but we can suggest you google for more details), and then get it converted.
Once it's convertible, you're better putting it into a more adaptable format like RTF or HTML, and then you can edit the look yourself instead of dealing with default PDF output settings.
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