Well to answer my own question, partially anyway, I found a NY TIMES article from January 1966 which revealed that construction along the LV main began in the summer of 1965. But union squabbles and a delay in the Port Authority acquiring additional PATH cars for extra Newark service were holding things up. CNJ President Perry Shoemaker told the TIMES that in his opinion service could begin in Spring 1966 with or without the extra PATH cars. The head of a coalition of 21 separate CNJ unions responded that he thought that was too optimistic. Turned out he was right too. (Service began on May 1, 1967, right?)
Anyway, the TIMES article said four grade crossings were being eliminated and had a photo of existing ground-level LV track (in Union) with the newly constructed viaduct off to the right. Not sure which direction the camera was facing. Also had a photo, much better quality, of the Aldene ramp between CNJ and LV under construction. No track yet, but the fill was complete.
Hope the foregoing jogs somebody's memory!
Sonny