Had one twist in half and lose oil pressure.
Had to change it in car 'galaxy 500' with hoist to raise it a hair and remove the pan enough to get my hand in to remove the broke pc. The tension washer that held it up was not there. Was a pita. Had another one that had a burnt exh valve or 3... reman'd the heads and reclocked the distributor 'it was rigged to run ' and the damn intermediate rod...it was jammed into the distributor shaft and even cracked it. Had to pull it and weld and grind the distributor. Got it running great. "Like a top" as they say.
Did another in a 'been sitting' deal. LSS...fired it and no oil psi....i show up and went to prime the pump by removing the distributor and turning the rod......but no intermediate rod was there...it and the oil pump was sitting in the bottom of the pan!
Put truck on lift, pulled pan to install new pump and found them there. Did the rod bearings 'since they ran it dry' and pump n rod... still driving it this day 8 yrs later.
Damn 390's .
..