Who can identify this Intake Manifold?

[Brandons63]

Hey guys, I picked up this SBC intake manifold for $30 to swap my 327's Rochester 2jet to a 4bbl. Most of the factory cast iron manifolds I've seen have had 2 small ports and 2 large ports. This has 4 large ports. I've tried to google the casting numbers with no luck. What do I have? Also, I have a quadrajet carb, but the mounting holes on the baseplate don't match the mounting holes on the intake. The carb is too narrow left to right. I think it was on a BBC boat motor. Any help there? I have a lead on a edelbrock 600cfm, but wanted to make sure I don't have some strange manifold. Thanks guys!