In the pics you have posted, it seems to me the rocker arm shaft oil holes are
more in line with the hold down bolt holes? Are the rocker shafts OEM or aftermarket?
Just check your shafts to make sure the oiling holes are facing to the lower side, to
the bottom edge of your valve cover, or to the exhaust manifolds or headers. If the shafts are OEM units, have you ever knocked out the end caps, and clean or have the shafts
boiled out at your machine shop? Just some FYI.