Magnum block mdded to oil LA heads?

Coronet 500 said
I drilled and tapped for NPT one of the horizontal bolt bosses in the back of the heads, drilled 1/8" diagonally from rocker shaft pedestal into it. Joined them with a tee and tubing from the oil pressure port beside the distributor. Ran this on the son's race car with no problems, the full time oiling through the 1/8' hole was a guess but was just the right size.
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I ain't tried this yet but a guy wrote that he drilled horizontle into the back of the head till he reached the bolt body in that rear pedestal and also he drilled a .060" (iirc) vertical hole in the holdown bolt length then a horizontle pair of holes at the height where the bolt is inside the rocker shaft.