Bubba, I have the same problem as you. The only thing I could come up with was pull one valve cover off and use a trans funnel from Advance to pur the oil down into the lifter galley. Maybe not the best idea but it beats spending 20 mins. trying to pour the oil in the small hole in the breather.

i just drilled & tapped the covers to fit -8 fittings. this way theres no oil dripping on the headers & making a mess. the valley plate also got drilled & put a capping fitting in there for adding oil. trying to get oil in thru the open covers is a pain as you know the oil is going leak out at the back of the head.