I just purchased new valve covers and they come with a breather in each cover, which look much better than the PCV tube. Can I block off the PCV valve port in the intake and just run the breathers or much I have the PVC valve? Thanks!

You can, but you may not like the oily mess on your valve covers after you drive it a while.

PVC = polyvinylchloride...a plastic
PCV, run the PCV...no sense in running dual breathers on a street car. The PCV does help keep your oil clean and may provide a little better ring sealing. Breathers stink up the engine bay and interior. The only reason to run them is if you don't want the PCV to dillute your intake and mess up fuel distribution on a race engine. If anything, run scavenge tubes in your collector and hook the PCV to that.

Whoops, I always confuse PVC and PCV. Thank you for the info! As you mentioned, I am going to stay with the PCV. Would you mind expanding on what you mean by "run scavenge tubes in your collector and hook the PCV to that" I am not quite sure what you mean.

Also, should I remove the vent in the other valve cover and replace it with an oil cap?

45 degree tubes on the collector with a check valve on top so that the exhaust pulses pulla slight vacuum.

Moroso sells a weld in kit but if you have some old smog legal headers or manifold you can simply chop the top of the air tube off a set of old headers (the section with the NPT thread where the check valve threads onto) and weld those on the collector at a 45 deg. angle.

Thanks for the explanation. I am actually running Hooker 2460's w/o air tubes. I guess the simplest thing to do is just connect the PCV valve. Not a big deal, the valve cover breathers just looked really good. Is there anything worng with running a breather on the opposite side of the PCV valve?

Nothing wrong with it at all. PCV valve in one and breather in the other is exactly how it should be done.