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Location: Hernando, FL
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I have that Chiltons manual as well ... and while it is hard to identify ... there is a wiring diagram that includes speaker wires. There is either a "radio" diagram or one with accessories ... I've seen it (I used it for my own speaker wiring) but I can't remember any better than that.
As far as measuring 5.7-6.2 DC ohms on the speaker ... it isn't a 4ohm. There is a such thing as a 6 ohm speaker and it is possible that you have them. They might be 8 ohm speakers but I'd expect a little higher reading than you reported for an 8-ohm speaker. Mind you, you wouldn't measure 8 ohm with a multimeter because ... 8 ohm refers to an average impedance and you are measuring DC resistance (two different things).
I wouldn't be concerned with running 4 ohms on there regardless of what you had in before ... any headunit should be able to handle a 4 ohm.
If your speakers are wired out of phase from each other then what will be most noticeable is less response in the lower frequencies. Sound quality can be effected in the vocal and treble ranges but that is less predictable.
You should be able to figure out proper phasing by simply connecting one speaker ... and then connecting the other speaker with one polarity and then the other. Listen to something with some bass tones and keep it whichever way has better bass response. If you do this, make sure to actually mount the speaker in the door each time since an unmounted speaker will have poor bass response itself.
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