You need to shield the oil filler port and the pcv from the oil splashing.
If you don't 1) the oil filler does not have the capability of 100% sealing and will leak oil 2) the pcv system is going to be flooded with oil.
As far as using the drip tabs with roller rockers, you can use them but you need to take sheet metal snips and trim them to length to make them fit.
Is it worth the effort? That I don't know BUT as one of my "friends" says, "Ford didn't bother with them for nothing?"
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