My engine currently oils by both methods. Either works and good luck finding replacement rockers without the squirt hole.
And if the heads are off anyway have them tanked with the oil feed hole plugs out. Then use brake cleaner like Bill Hanlon suggests with drill bits and long round brushes through the feed hole and be sure it is cleaned. Liberal use of air pressure to force stuff out the holes. Put it back together (may need a valve job anyway) and it will oil by one method or the other. Maybe both. I doubt it will have much adverse effect on oil pressure.
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