I have previously done the mod on my 2.2 engine but the layout on this 2.7 is not the same. Daylight is visible when looking down from the feed hole, there is no angled cross drilling but it does have cross drilled oil ways from the side and front of the case which intersect to create the connection.
I decided to go ahead with the plugging but found it impossible to tap straight due to the lack of space , I don't have access to a lathe so used a 29/64" freeze plug and epoxy.
I'm still puzzled by the slotted lower hole which you can see below the plug.