hoses on valve covers?
sure you could drill the new covers, but i'm not sure a bare fitting would work so well. would be wide open to suck oil up in it. granted running it through a catch can could solve that...as long as you're diligant about draining it i guess its fine.
you still have to have the lines run to the intake though...you need vacuum somehow.
do some searching, there are plenty of threads about different ways to set up PCV systems.
but i think the easiest way if you're getting valve covers with no ports is to just plug the air outlet on the TB, and the vacuum port on the manifold. then run a breather on the oil fill cap.

