Those holes are for a Weaver N3 scope mount. They aren't made anymore but are still fairly easy to find at gun shows and the internet. The N3 will limit you to a old Weaver 3/4 inch scope that may not have held up with age. Although, many old Weaver 3/4 inch scopes seem to hold up well over time but the optics leave a lot to be desired compared to modern 1 inch scopes.
There is a modern Weaver mount that will allow you to use a 1 inch scope. You will need the Weaver #2 mount and the rings that attach to it.
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