Breather placement

[01somta]

I'm going to be drilling my gm performance valve covers this weekend for my breathers. I bought a billet specialties breather w/o pcv for one side and another with pcv valve for the other. Is there any particular place to put these. Does the pcv need to be on a certain side? Do you offset the breathers with one towards the rear of the valve cover and the other side with towards the front of the valve cover. Or can I put them both towards the rear? I thought I read or heard that this matters do to engine torque.