The FSM shows the same cam and spring specs of the 383 2V used on the Charger 383 4V, but the Charger has 10.0:1 compression vs. 9.2:1 on the 383 2V. It also shows the 383 4V used in the Dart and SuperBee as using the same cam and springs as the 440 4V. I've always seen HP manifolds used on 383 4V Chargers.
