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If you had full coolant flow through those holes coolant wouldn't go through the rear half of the engine... Those passages are how sand gets removed during the casting process..... The small uncovered areas allow trapped air to escape..
If you are worried about a coolant leak at a little JB weld. Don't laugh. Apply with a razor blade to fill the indentations. My race motor had some corrosion pitting. Far more severe than what you have. Ran it with JB in the pits. Worked fine at 15-1 compression. I've repaired T-stat housings and water pumps the same way.
Doug.