I found this on Ebay. It looks like an adapter to allow you to put a DCOE or similar sidedraft on a manifold for a two-barrel downdraft. Has anyone seen these before? It looks pretty cool, but I wonder whether there would actually be any improvement in performance. Also, it appears that one would have to have the carburetor pointing forward or backward rather than to the side.
http://cgi.ebay.com/ebaymotors/1963...53541259QQcmdZViewItem?hash=item230253541259&
http://cgi.ebay.com/ebaymotors/1963...53541259QQcmdZViewItem?hash=item230253541259&