I have two 292 blocks that I have had stripped, cleaned and machined. They pulled all of the oil galley and freeze plugs - a good thing. I bought and installed John Mumert's SPK kit for the oil galleys and freeze plugs. I have these two holes at the skirt line just above the oil pan on the passenger side that have nothing in them. The 1/4" plugs in the kit do not fit the holes. They are 7/16 - 16 bolt size holes. Wat goes in here? Thanks.