Magnum block mdded to oil LA heads?

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.