holley 670 carb help needed.

I bought a used 670 holley carb and since it has been sitting on a shelf for 5 years I decided to put a kit in it before I try and use it. My question is about the base plate. I noticed that the long grooves on each side run almost the length of the plate and go to a hole at each end. One of the grooves has a thin wall that is maybe a 1/4" from the hole on each end. It looks like it was not milled correctly and I think it should not be there. But want to be sure before I dremel them out.


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