Run the oil slinger, they are cheap and worth the cost vs benefit.
http://www.manciniracing.com/oilslinger.html
Now for the camshaft thrust plate bolts.
1. Best is to drill a hole in the top pass bolt like the factory original. Or find an original style bolt.
2. Next best is to leave that top pass side hole open. I would recommend then drilling out the bottom driver's side camshaft thrust plate hole, so you can make the tab hook in there and also use the bolt in that hole.
3. Or you can just leave the top pass bolt out and not use the drip tab, and then use the three remaining bolts in the trust plate.
I would recommend 1 & 2 first, then #3....