Good morning everyone.
Once again, thanks for all the comments, links and references for "SMOG" ventilation systems for our '68 T-code coupe.
After looking at the Thermactor pictures and references, our engine does NOT have a Thermactor system...even though it is a 3-speed standard / manual transmission car. I am not venturing into the IMCO side of the house. HOWEVER, with your help in narrowing my search, in Section 8-38 of the 1968 COUGAR FAIRLANE FALCON MONTEGO MUSTANG SHOP MANUAL...there is information about the CLOSED CRANKCASE VENTILATION SYSTEM. The photos on this page for Group 8 170 and 200 Six, show the components, connections and relevant parts for the Closed Crankcase Ventilation System. The figures in the manual and our engine match 100%.
That's where I am so far. Research continues. I'll post more information as I find referenced, factual material.