wrench87 Yes you can put a PCV valve there. That hole is really for a return line from the puke tank for
oil. I run a breather and pcv on my valve covers. There are shields in most valve covers to keep
oil from being sucked into the pcv and then the motor. The other thing is that the EFI manifold should be balanced ported for all the cylinders. There is between a 10-40cfm differents between ports. Joe craine will balance up the manifold to within 5-8 cfm. This way you have all clinders working the same. My dove went to him, it was worth the money.
You have the heads ported. He has about a 1 week turn around time. Rick L.