It happens. A lot. And whoever had the threaded plugs is screwed. If he screws those big nasty pigs in to flush, he'll cover the feed hole to the drivers side lifters. And the holes are now to big to hold the freeze plugs. So he can just run the plate like I always do. Also, if he has the plate with the cut out in it, I'd look for a good used OE plate that doesn't have the cut out.