Oil pooling

Logan said
I had a problem like this once (not Mopar). Turned out the head gasket partially covered the return drain holes. I was able to pound a slim drift pin into the holes and crush the gasket outward.

Made the mistake of using STP some time later and the increased viscosity caused the problem to return. Hope you're not using the heavy stuff.

those valve covers have always been a pain in the but to most people who run them, sooner or later they do what you are describing. most people I know won`t use them. oil pools in most heads too. sounds like your rocker arms were at fault too, not the heads.