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
Top view
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.