Noise between bellhousing and Engine

If the bolts are interfering, AKA hitting the engine you should be able to see that with a good bright light and inspection mirror. Chips, bright spots, "corners" knocked off the bolts and chips out of the block in the radius that the bolts rotate. Get a means to pry the crank forward and aft on the crank end play and see if that "tells" anything. A common problem is ??warpage?? of the dust cover, that is the cover itself rubbing.