Did you clean the main oil journal that runs along the side of the block? When I rebuilt my L28E that had thrown a rod bearing, there were fragments all through the engine. I pulled the journal plugs (front & rear) to clean out the main journal and spent 3 - 4 hours cleaning every oil weep hole on that engine. If you can't clean an engine before rebuilding it, it's a waste of time to rebuild it because it won't last long.
Follow your mothers advise "Cleanliness is next to Godliness!"