Thanks, do you happen to know where people would drill this hole?Your engine block has oil "galleys" that are passageways for the pressurized oil to pass through. There are diagrams on the internet that show the galleys in a 351W block. One of the lengthwise galleys ends right behind the distributor and there is a plug in the block to hold the oil in the galley. Some people drill a small hole in this plug to allow oil to spray out onto the distributor and cam gears.
We have examined the gear on the cam, luckily for us it does not appear to be damaged.
We have removed the gear from the distributor shaft and we will be buying the MSD 85834 steel gear.