[blucar]

I would think that the port could be enlarged to accommodate a thread in PCV. If you used the port for that purpose you would need to block-off the pan breather, usually lower left front if you engine has one and use the air filter type of oil fill cap.
Fresh air would be drawn into the engine via the breather cap, then mixed with the blow by from the crankcase and drawn into the intake portion of the engine to be burnt off.
This would be similar to the '64 292 Y block PCV system. The 292's had an angle plug screwed into the intake manifold, then the hose from the PVC would have to be plumbed into the block/crankcase. On a 292 the PCV went into the valley cover to the rear of the carb. You could drill and tape a hole in the front of the intake that would access the block in lieu of the intake chamber, that would complete the fresh air loop within the engine.
I am planning on doing something like the above on my 59 AB engine when I freshen the engine up in a few months.