"Stinky smoke" would be making me look for other issues, like excessive blow-by or bad valve seals. In good condition, it should be running relatively clean... Is the smoke coming from the road tube?
To answer your question, the easiest way to add a PCV is from a donor motor, something '66 or earlier.
You will need the valve cover and carburetor. Remove your units, and install the newer valve cover with PCV and breather. Install the later carburetor (up to '66 will have compatible mechanical throttle and kickdown linkage for your car), hook up the PCV hose from the valve to the new carb's PCV port. Attach all linkages and other vacuum lines as they were before.
Later model parts could also be used, but would require fabrication to the throttle and kickdown linkages to operate properly (or replacement with later cable-operated parts), and would also require the later model air cleaner with an additional fitting for the late model valve cover breather hose; and kind of spoils the period-correct look...
Thank You- Good info. Well it hadn’t run in 3 months. Got a lot of smoke initially out of oil cap breather cap then it got
subsided. I didn’t look at road tube - don’t they both vent the same areas?
Anyhow maybe road vent blocked - I’ll check. RA
