Some don't recommend breathing from cam cover and breath from both parts of the block, others breath from cam cover and std location then connect oil drain to other side of the block, both methods are used and tbh most breathers are connected this way I believe breathing from both sides of the block is better for track work as the breather can get blocked with the oil in the sump then the oil in the head doesn't drain due to breather in head giving less pressure at the top of the engine. Don't think it would happen on the road though,