Thanks for the info Mackie, being a firefighter I have a good idea of what positive ventilation is. I'm simply saying that my '68 327 is only vented through the oil fill tube.
Maybe 1968 was an anomaly because it was the last year of the 327? I can see now what the flat boss near the distributor is for, but the hole was never machined in the block for a PCV. Prob be better off with the PCV valve but I plan to run the engine as is.
heres some pics. These are the original valve covers but i'll be running some scripted covers.
