Just replied to your other post......honestly if you were in the throttle for any more than say 30 to 50 seconds wide open doing half that rpms with out the oil mods done your bearings are toast.....i have a olds and 2 of my buds have olds and blew em both up this season....one was cause the oil pick up wasn’t set right and ran out of oil at 4000 rpm and the other had extreme blow by keep running it high rpm also blew the bearing ran out of oil.....good place to start is get a stethoscope and hear where it is knocking or pull it  and check the bearing and hope it didn’t mess up the crank shaft....