On most 216s, that big pushrod cover that also overlaps the cylinder head can be a bigger source of grief than the valve cover. Gluing the valve cover gasket firmly to the head to create a shallow dam and being sure all the drain back holes are clear and smooth so the oil has a clear path back to the oil pan also helps. The best remedy would probably be to fabricate a PCV setup to create a slight negative pressure in the crankcase and valve cover.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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