I agree there shouldn't be blowby. Check and find out if there is, though.
Errrr...no. In '64 you have two chimneys on the valve cover. The front chimney gets a combination oil cap/breather. It contains mesh and has a ring of holes on its underside. Air comes in those holes, through the mesh and into the crankcase (on California models starting in '64, the holes were replaced by a hose nipple connected to a similar nipple on the air cleaner body). The rear chimney gets a smaller stamped steel cup with a PCV valve in it, connected to the carburetor base by a hose. There is not supposed to be a "can with mesh" on the rear chimney. If your PCV valve and hose are missing or incorrectly put together, that's probably where all this is comin from