But I expect if there was an issue it would only be if someone used Magnum head gaskets on an LA block with LA heads. Most Magnum blocks don't have the drilled passage so a missing hole in the gasket wouldn't matter, and it's also true when using Magnum heads on an LA block since the head wouldn't be drilled.
At the same time, comparing pictures on RockAuto makes me think they never removed the oil hole from the gasket. At least I don't see any missing holes in the Magnum gasket, and I do see ones that (I think) are for the rocker oiling passage.
