I like to run the pcv into the intake tract above the throttle blades so as to not pull vacuum at low rpm's which can just help
oil get pulled into the intake (especially with aftermarket valve covers which have piss poor baffling). You really need the pcv at rpm when blowby is happening. At rpm, the vacuum signal is the same above and below the throttle blades. At idle, there is a ton of vacuum below the throttle. SO if you run it into the carb vacuum nipple, you will pull more air through the PCV at idle, but the same amount at RPM. That can allow more
oil to get pulled through the pcv and burned in your engine, at idle. That's the way I like to do it, but you can just get a 3/8" TEE fitting and splice it into any vacuum line you want and it will still work, but
oil control may become an issue. All this is assuming smog exempt status, so keep that in mind since a PCV is a smog control device.