no special challenge in my motor either....it runs 12psi not 30 or 40! And built with quite tight clearances (less power but more time between rebuilds). It really doesn't breathe at all.
But FWIW...I have nitto pump, oil return at the rear of the head, enlarged block oil returns, restrictor in head oil feed, standard cam cover baffles with fuel cell foam behind, small oil/air seperator above motor, and catch can in the engine bay.