javascriptを囲えば大丈夫じゃないでしょうか

{% block javascripts %}

<!-- Google Code for 商品購入 Conversion Page -->
<script type="text/javascript">
/* <![CDATA[ */
var google_conversion_id = 666666666;
var google_conversion_language = "en";
var google_conversion_format = "3";
var google_conversion_color = "ffffff";
var google_conversion_label = "bq_nCObbvWUQ_qq6qqM";
var google_conversion_value = 3000.00;
var google_conversion_currency = "JPY";
var google_remarketing_only = false;
/* ]]> */
</script>
<script type="text/javascript" src="//www.googleadservices.com/pagead/conversion.js">
</script>
<noscript>
<div style="display:inline;">
<img height="1" width="1" style="border-style:none;" alt="" src="//www.googleadservices.com/pagead/conversion/938386666/?value=3000.00¤cy_code=JPY&label=bq_nCObbvWUQ_qq6qqM&guid=ON&script=0"/>
</div>
</noscript>

{% endblock %}

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