360view, the ME Wagner valve has several adjustability features.
They also built a PCV dyno/flowbench of sorts to figure out the whole thing.
The instructions have a chart to determine a baseline setup using CID and idle vacuum.
Notice how AndyF's valve has one screw backed way out? Thats to cover super low vacuum situations. $127 is a major chunk of change, but the valve is rebuildable and will always work for whatever combo you build.
Incidentally, I checked crankcase vac on my Dakota and it is 7" at idle.
