The E58 was awesome engine with HD parts as was all Mopar Police engines back in the day really.
Special coated HD valve springs, Double roller chains, windage tray, better cams, poly coated fuel pump eccentric as well. They have a deflector inside the timing chain cover too. The ones with an oil cooler used a special bolt on the fuel pump that was hollow. The return line from the oil cooler fed oil through that bolt back into the timing chain. Nodular iron cams, sodium filled valves, special anti scuff oil piston rings, and the list went on and on. I have several "Police/Fleet vehicle" brochures and they list out all these upgrades that Ma Chrysler use to do on their Police Package cars all the way from the 318 through the 440. That all ended after 1989 and now the Charger Pursuits really don't have the upgraded internals. Bigger brakes, HD cooling, suspension, oil coolers, heat protection and some other things but the engine is exactly the same.