The slinger was used to keep oil from flooding the front seal and keep oil on the chain. I haven't used any of it lately. Only thing I have used was the bolt with a hole in it in the top left. There should be plenty of oil coming off the front main to lube the chain. A .040 hole in the retainer with 60PSI behind it will put an awful lot of oil in the timing cover. I spend time reducing internal leaks and make sure the plate is sealed to the machined surface.