Are PCV needed?

The right way to do this is to have a breather PLUMBED TO the air filter bonnet on one bank, and the PCV on the other bank. Also, if you have any sort of smog inspection down there, that is the way it must be plumbed--no breathers open to the air

I agree though, that many MANY aftermarket covers have a REALLY poor baffle setup

I'm still using the old aluminum (Cal?) covers I bought in 72. I'm using a Ford twist on filler/ breather combo for a breather.

Like this one, I hope not this price. The fitting on top goes to your air filter

http://www.semomustang.com/store.aspx?panel=3&productid=606&categoryid=240