340 cam bearing alignment?

They make a bearing scraper. If it were me I would throw those bearings away and get durabond coated race bearings. They usually fit perfect and are a better bearing. Just one of those parts you only want to do once and have them last. King bearings for the mains and rods. Although Clevites have more selection of sizes when clearances are critical.

This alignment may be acceptable. But is that want you want? "Acceptable" If it was my motor they would have to be right on the money. Proper oiling is the most important thing for any motor. Main oil passage from the pump that was there from the factory is "Acceptable" But everyone drills them to 1/2 inch. Just something to think about.