Two options for hooking up a Ford 3G alternator.

Season 3 Episode 94 Wiring a Duraspark 2 ignition into a '65, 66, 67, 68, 69, 70, 71, 72, 73 Ford

This diagram is for the Total Performance harness sold though National Parts Depot.
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Season 2 Episodes 30-33 Ford 9-inch axle pattern guide.

While this pattern guide is for the Ford 9-inch video series that we have HERE, you can also use the guide for pretty much any ring and pinion set up.
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Episode 28 Season 2 Power window control via relays and Thunderbird switches

This schematic is courtesy the Vintage Thunderbird Club International with some assistance from Squarebirds forum, thanks guys!
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Episode 17 Part 2 Season 2 Derale Controller wiring.

In theory this should work and keep your original 1967 Mustang harness intact.
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Click image to go to a larger downloadable image.

Late 1967 Mustang A/C Vacuum hose layout.

Is this right? Maybe not. But it does show the layout of the AC vacuum hoses.

Go here: http://www.youtube.com/watch?v=3UkTsI_fnkw to watch the install.
late 1967 Mustang a/c vacuum hose layout

Go here for Mustang side vent template from stereo episode 57 Season 2

Click above to access the image of the side vent.