I am chasing the same leak.
Do not overlook the valve covers even if they feel dry.
They could be running down the gasket joint where the head and the intake come together.
I pulled one of my valve covers replaced the gasket a put high temp sealer on both sides of the gasket and reduced the
oil leak. Back of the heads was dry.
I need to do the other side and see if I can reduce it to a bead hanging off the bellhousing and I will be happy.
Let the sealer dry overnight before you fire the engine.
hope this helps