Cusser
+1y
Sounds like a leak from the rear cam plug possibly.
If I understand this correctly, you had the camshaft holders out and the camshaft, so I suspect the rear camshaft seal, circular rubberized disc. Did you install a new one, use a light film of Permatex, and torque correctly? Have good photos?
Your leak is not from the valve cover put on crooked, is it?