What carb is this?

[Kalums]

Ok... Here is one for you guys, Holley doesn't have much information on this carb, I just realized it was in a box under the cradle portion of the actual crate my engine came in ( still have the wood crate...probably bought separately and shipped together with the engine, I'm assuming. ( I'm a lazy bum, was going to use it for fire wood when camping) it has a list number of 80712, All I can find is it should be a 670cfm "from GM". It has vacuum secondaries and is a square bore. Literally nothing else. Any and all info would be appreciated.