New motors may take a while for the rings to seal up well Did the block have a torque plate on it when honed? If not it may take longer for the rings to seat On my 511 and 518 C.I. 400 stroker motors I ended up with two PCV and two breathers, one each on both valve covers
Having an intake vent and a PVC valve on both covers would just vent the area directly below the covers. The idea is to pull outside air from the valve cover with the intake vent, through the crankcase and out the PVC valve on the opposite valve cover using manifold vacuum.
Did the block have a torque plate on it when honed? If not it may take longer for the rings to seat 
