MAXIMUM Header Gasket Thickness?

I have thought about shaving a little off the valve cover. The tube barely touches with just one gasket. There is about an 1/8 in. separation with two gaskets on. Here are a couple of pictures. I think things will get tighter once I really torque things down and re-torque after a 100 miles or so.

Valve Cover with 2 gaskets
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Top view
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Why not use thicker valve cover gaskets to raise the valve cover. I used a set of 5/16 gaskets to help clear the intake manifold runners. I got the gaskets from Fel Pro.

Unfortunately, that may actually exacerbate my problem as you can see in the pics.

I may even be able to buy new gaskets and try to push the vlave cover up just a bit to add some clearance without causing an oil leak :dontknow:
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