Some of the later 440 blocks have the two bosses cast into them and they are tapped in fact I have one that I’ll never use. These bosses are in the same location as the 383 so the same motor mount bracket would work on both. If it were me and I had the original 440 bracket I would just drill and tap the oil pump bosses and be done with it. That’s what I did when I put my 440 ‘cuda together years ago.
