Edit the postbit_legacy template. This is the code that displays the reputation bar:
Code:
<vb:if condition="$show['reputation']">
<span class="postbit_reputation" id="repdisplay_{vb:raw post.postid}_{vb:raw post.userid}" title="{vb:raw post.username} {vb:raw post.level}">
<vb:each from="reputationdisplay" value="row">
<img class="{vb:raw row.class}" src="{vb:stylevar imgdir_reputation}/reputation_{vb:raw row.posneg}{vb:raw row.imgext}" alt="" />{vb:raw row.rowend}
</vb:each>
</span>
</vb:if>
and this is the code that displays the power:
Code:
<vb:if condition="$show['reputation']">
<vb:if condition="$show['reppower']">
<dt>{vb:rawphrase reppower}</dt>
<dd id="reppower_{vb:raw post.postid}_{vb:raw post.userid}">{vb:raw post.reppower}</dd>
</vb:if>
</vb:if>
So all you have to do is move the bar display code to be under the power code.