One trick we used on the small block V8's to prevent valve cover flooding was to deburr all the drainback holes with a die grinder and eliminate any restriction to the oil getting back to the crankcase. Using positive valve stem seals at the top of the guides will control any tendency to burn oil, but if that's done, the original-equipment O ring seal on the lower valve stem groove and the sheet metal shroud over the top of the valve spring needs to be eliminated. Otherwise the valve guide gets starved for oil and it wears out in a hurry.
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!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!