[Dodge]

Ouch. Is this a new rebuild from an engine builder? Or a freshen up by the owner.
If engine builder take it to him. If not....
I had one like this come in and the fix was a different crank with oil slinger on it and stock
rear seal.
It sounds like the rear main cap might have been modified also.
I think your going to have to pull the motor and have a good look.
Take pictures so everyone here can have a crack at it.

Best of luck