Uh Oh !! Bad knocking !!

It may not be a rod bearing, normally you'd see a drop in oil pressure unless the bearing is friction welded to the journal. Best case scenario may be something in the clutch/flywheel end of it.

Just thought of something real bad--What crankshaft? Eagle cast cranks have been known to break. I have seen many engines with broken cranks still run and run OK but with horrible sounds. Hope you find something in the clutch end of it. J.Rob