What Mike suggests is the way most folks will do the job. However, it does put more burden on you to maintain your engine. It's especially important if most of your driving will be lower speed, stop & go, etc. You'll need to stay on top of your oil changes.

Reason is you'll be venting at the front and the rear of the lifter valley. The air will take the path of least resistance. This setup will favor the air circulated in the valley, and only get the crankcase and upper head air by "bleed over", in a sense you're not getting "positive" crankcase venting. It's a relatively short path from the crankcase to the valley, so that won't be as bad a potential problem as the upper part of the heads (where the rockers are). There will always be some circulation, but less than the ideal where the in and out are in the valve covers.