Looking for some 440 help....

We have a ’68 440 Magnum and where the head meets the intake, in the center, between the runners, for the lack of a better description, is a U shaped “pocket”. This pocket fills with oil after the engine runs for a short period of time eventually splashing everywhere resulting in pooling oil on the intake. I have changed the valley pan under the manifold, the end rails and sealed it all with the supplied Mopar RTV. No leak from that area but the oil is still finding its way into that “pocket”. Is this a common occurrence with 440’s? Any ideas on what is causing this and how to prevent it? Could it be a head gasket or worse…? I do not see any coolant just oil. I’m looking for some opinions as I am a Ford guy and have gotten into Mopars in the last few years. We are trying to determine if this is an easy fix or if we should tear the whole deal down for a much needed freshening sooner than we had planned. Thanks for any suggestions or advice….