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Maybe we’re talking about two different openings? The larger opening shown in your picture needs to be filled with what is typically called a “welch plug” or core plug. They come with the carb kits sold for your engine. They are placed in the opening and then impacted with a punch so as to expand them a bit and hold them in place.
That plug absolutely needs to be there.
OMC carburetors have other openings from the casting process that are sometimes filled with led shots. More often though they are vents and need to be left alone.
Install the welch plug and try getting the idle circuit dialed in; after dealing with the issue with your slow-speed needle. If there are still issues you could try temporarily plugging a smaller opening with your finger or a screw…..see if things improve. My guess would be though that the smaller holes are vents that need to stay open.