So I'm not the only one befuddled by the vacuum hoses on the M110
One goes to the under side of the intake manifold on the back (closest to the firewall). I marked this one "to manifold" on the picture.
The other, can be vented to the atmosphere (as far as I understand). On my car it was connected to one of the hoses under the idle air adjustment screw.
The one that goes to the intake manifold is the important one. If it is disconnected, you will run rich.