This adapter plate allows the reorientation of the points cover screw hole pattern from horizontal mount to vertical mount, or vertical mount to horizontal mount. The countersunk hole set is mounted to the cam cover, using countersunk screws. Then the points cover is mounted to the plate.
Please note, the specific mount style, for this plate, is the early rivet version. That means the points cover mounting holes are not threaded. Therefore, you must use pop rivets for mounting. Or the holes must be tapped to the correct screw size.