It would depend on original engine type and intake set-up.
Some L-6's and V-8's had a tube fitting installed into the original draft-tube port that hooked into the base of the air cleaner pan (early air cleaners used a flat[ish] base pan and then a 'cake-cover' top stamping that went over the element - the opposite orientation of most 1966/67 and later air cleaners ... ) and a 'Breather' cap was installed on the Oil Fill tube, or valve cover for 6's.
The above design systems just used the pressure in the crankcase to push any vapors into the air cleaner so they would get sucked into the carb and burned.
The majority of small V-8's, including 327's, from 1962 ~65 had a fitting in the oil fill tube that had a small orifice in it to meter a small amount of crankcase vapor through to a fitting at the base of the carb. This system was sort-of a 'small vacuum leak' that could pull vapors out of the crankcase and prevent it venting to the outside.
There was a large tube assembly that was installed into the rear port (where 'draft tubes' were installed for 1955~61 V-8's) and it plugged into a hole fitting in the base of the air cleaner assembly (a base plate and a top 'cake cover' stamping, with the snorkle on it).
I've owned both a 62 and a 65 327 equiped car that had this system.
Here is a picture of this type of system on a 65 'vette;
Please pay no attention to the modern carb type and other mods - it's the PC hook-up we're looking at
All 396's, introduced in the 1965 model year, had PCV system with the valve installed into the passenger side valve cover.
All 1966 and later engines had a PCV installed in replacement to the orific system used in earlier years.
The 1966~67 small blocks with a "Closed" PCV system - used a PCV installed in the oil fill tube.
The 1966~67 small blocks with a "Semi-closed" system - used a PCV in a hose routed to the adapter tube installed in the rear port of the block. This adapter looks like an 'upside-down' Dixie cup with a fitting on it.
Some smaller engine types from GM just used a 'T' in a vent line from the fuel pump into the base of the carb. There was a very small orifice in a brass fitting for the tube that limited the vacuum flow - 'sorta' ... folks had a habit of loosing or removing the orifice for some reason.
This applied to all vehicles.
These were not combersome "Smog" systems that required much if any service, like the 1967~68 on systems, so many people that owned these cars never even knew they were there.
I recently helped a buddy redo a system for his 1962 Jeep and get the system woking again. It had a piece of small vacuum tubing hooked from the fuel pump vent through a small valve then 'T'ed into a vacuum line going to the intake - took some time looking through Jeep literature to find the correct hook-up as it had all been removed years before he got the jeep.
Hope some of this helps, let me know if you need a specific part referal or information.