Starting and Running Problem...

I went out and bought a feeler gauge so how do i measure? I have the .010 out, am I supposed to fit it underneath the rockers and tighten till it lays right on top of the gauge? It seems like I would have to tighten all of them too much to get it be down on the gauge. Also removed all the spark plugs and #6 smelled like fuel and had oil on it. Here is a pic.

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