These are all common procedure mon any FE engine build. You can place your bearing in the saddle and mark the hole in the bearing. Use a die grinder to chamfer the
oil galley over to the bearing hole location you have marked and then deburr the area you ground. As stated above it is a good ideal to do the
oil filter mounting pad area as shown as well as where the
oil pump mounts. It is also a good ideal to open the passage from the oil pump to the filter mount if not 7/16. We drill all of the early blocks main oil passages to 7/16 since some of them were smaller than this. Good luck, Keith Craft