The second photo shows the 3- fittings I have available for the 66 tripower
The 66 intake has a pair of pressed in posts, that are 3/8" between the center and rear carbs. Each takes a 3/8" hose that attaches to this F-fitting. The F-fitting exits to the passenger side where a 3/8" hose runs to the PCV valve in the valley pan.
This F-fitting here is white in color with no markings. these are custom made for the 1966 tripower. These are an alternative to more costly metal F-fittings.
Also have a kit on the page to replace rubber hose from F-fitting going to PCV valve.