Searched thru the pics I have and seemed to have proof both ways. However got pretty good proof by looking at 500700 and 500711S. See below.
Attachment 470631Attachment 470632
Think those positively prove you assertion since 500718S was the last '67 targa. Thanks for the mental exercise. See also the discussion on this: http://www.early911sregistry.org/for...nt+panel+drain