On a two headlight (combined hi/lo) the H4s plug right in. On your Chally, I'm not so sure, but Dan will know. There had been some issue with availability of replacement housings for the 4 lamp systems - that may be resolved now.

It will be worth considering installing a relay for the high and another for the low beam lamps instead of drawing power all the way through the dash. On the A-bodies this is almost a requirement because the wires from the dimmer switch are only like 16gage IIRC. You'll see in the FSM diagrams that the other models got slightly heavier headlight wires and IIRC the 20 amp breaker in the headlight switch. The H4s will draw the same current as stock but are more sensitive to low-voltage.