PVC or breather?

My car was delivered with two breathers, one on each valve cover. I've read some conflicting information regarding the need for a PVC valve connected to the carb. I'm replacing the carb with a Holley Sniper unit in a couple of weeks, but my question is "do I really need a pvc valve or will a breather on each valve cover do just fine?".

Thanks in advance!

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Also the power brake booster vacuum line should go to the back of the carb, not the front.