My oil burning pig. Pics too!

" the evac should be better than no crankcase venting system. And the PCV is not active all the time, like at WOT, which is where the evac will still be working. Evac's are quite appropriate for racing conditions where the engine is at WOT conditions a lot."

True 'dat.
The PCV is most effective at idle and decel when the intake vacuum is greatest. The evac system is strongest at WOT when the flow around the valve's siphon is greatest.