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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You need to have both PVC and breather, they work together to evac fumes and pressure built up in the crankcase.
Contrary to popular belief, when properly applied the breather actual draws fresh air in and is mixed with the fumes and exhausted into the engine via the PCV.