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i did the same install about 9 months ago on my 84 cj7. as best i remember, the holes are for locating pins molded into the plastic cover. the threaded holes should have 5/16-18unc threads. you can run a 5/16 bottom tap right into the existing non-threaded holes, without any drilling and have the correct hole i.d. for the threads. i stuffed paper towels into and around the valve springs and stems and held a strong magnet next to the holes that had to be tapped. after tapping the holes, i removed the magnet with almost all the chips and used the paper towels to wipe the remaining chips away from the holes. putting the towels inside the valve cover area before tapping the holes allows you to push everything away from the inside part of the head as you clean around the holes.
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