After some digging through my build thread I found this picture.

Here is the 2004 block. Noticed the black flanged area.




Here is the 2007 block. Notice no black flange or holes. Looks like the 07 valve cover is going back on, or I guess I could plug that port.




It seems odd that they would even have that huge breather there in the first place. How much blow by are you getting that you need a 1" vent hose on top of the PCV valve and normal oil passages in the head/block?!?