442W30:
I don't want to be argumentative but that Marti Report is for a Torino. You are moving the goal posts! Show us a Marti Report for a 1968 390 equipped Ranchero with a 3.25 locking rear. What may have been available on the Torino or the Mustang was not available on the Ranchero according to the brochure. THAT is the point!
Oh . . . . BTW . . .