I would suggest removing the tube, weld up the hole in the valve cover, and run a bypass line around the back of the cylinder head to the plugged hole in the middle of the head on the passenger's side. A piece of 3/16" steel brake line makes a good bypass line, and provides just enough restriction to avoid over-oiling the rocker shaft. Some modification to the rocker shaft oil connector might be required, depending on how the oil reaches it now.
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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