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I don't think it has anything to do with sedan or wagon, just angle. As to ride height, there sure is a lot of argument across the web about whether or not the GTs had different springs. My take on that is that all the springs were the same (excepting wagon rears). Tuning was done with the bars and shocks. I don't know about the Homologation Specials though, seems likely they'd have something special.

Ride height certainly does affect pinion angle. I wonder if these were offered as a means of coping with the "standard" loads different people carried in their vehicles. Looking at the drive shaft in the 77, it is almost perfectly straight from the trans right to the pinion. I'll bet the angle is almost zero. Makes one wonder what happens when you put 400 lbs of passengers and luggage in it. I'm tempted to put shorter rods in it when I do the bushings.