Code A38

The police package cars back then usually had, besides what you mentioned, a larger alternator, heavier springs & sway bars, even heavier duty vinyl upholstery &, although it's never mentioned, I have seen some cars with thicker padding & springs in the seats. I can't remember what year but some of the manufacturers even modified the cars for more rear seat leg-room to deal with "passengers".
Mopar was strange back then as you could order a ton of HD stuff via the police package, yet get it in a small. stripped-down 6-cylinder car. The logic was, the larger PDs (like NYPD) needed the HD stuff but not the big engines as their policy and/or environment simply wouldn't permit high-speed, so why order the "extra" horsepower?
On the flip side of all this, there were PDs that went over the top, ordering the best of everything then allowing their officers to modify it from there. When I was in law enforcement in N.M., a local State Trooper's car looked like it rolled off of Daytona. That car had EVERYTHING---rollcage, big tires, Recaro seat, headers & a ton of stuff done to the engine.........