First you need to find where the noise is coming from. Push and pull on windows until noise gets worse or goes away. If that does not help then put paper strips between seals and the window or body, close door or window and then try to pull the paper out. If you find a place where it pulls out easily that is where the leak is or will be.
I would assume that it is either a Sport Sedan or Sport Coupe. Check to see if the windows bow out when driving. If so you may need to adjust the window track to bring the top of the window in a bit. Another problem can be the adjustment of the flippers. If it is a convertible then you might need to shim the weather strips if you can't adjust the window track enough.
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How Sweet the roar of a Chevy four!