Use positive seals- - - - -OR- - - -O rings- - - -not both. The engineers who designed the head factored in a little bit of leakage down the guide to keep the valve stem lubricated. Your valve stems will run bone dry now, and wear out quickly. The only engines I've worked on that ever needed the "head saver" gasket were GM diesels. Those gaskets come in four different thicknesses. The 292 doesn't have enough compression to worry about head gasket thickness.
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!