vac-u-pan breather location?

i had purchased a set of fabbed aluminum valve covers from 440 source and I was going to install a vac-u-pan system. the vavle covers do not have baffles, so I was wondering what the best placement of the breathers would be, so they dont suck oil. the vavle covers are consideably taller than factory sheet metal. should i have the breather at the front of the valve cover or the rear? should i just epoxy in some baffles? any advice is welcome.