[img]http://s1078.photobucket.com/user/raguza...acb01c.jpg.html[/img]
The picture above in the link is a Square Bore manifold, if you look under the Edelbrock you'll see the bores closely match the openings.
The manifold in the picture is a Pontiac 326 from 1967 for Carter AFB's and Edelbrock carb's only.