Basically you have two options:
<replace file="${APACHE_HOME}/conf/wc_server1.conf" >
<replacetoken><![CDATA[@Install_Base_Directory@]]></replacetoken>
<replacevalue><![CDATA[$InstallerBase]]></replacevalue>
</replace>
or since it replaces only one line, use:
<replace file="${APACHE_HOME}/conf/wc_server1.conf"
token="@Install_Base_Directory@"
value="$InstallerBase" />
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