Seems to be two points of view here and in other threads I have looked at.
Let's look at the facts as presented in the AIM's
Same part number 3758783 and torque used in all three years of production for this particular bolt.
Why would the torque of 60-80 in lbs (6.6 ft lbs) be applied to this bolt when the same size bolts in the same area have 120-180 in lbs (12 ft lbs) applied to them.
I believe that the toothed conical washer was specified and thus the lower torque value.
If anyone has ever tried to change a battery in a first gen then you know why the lead point on the bolt was specified, especially with AC (67-68).
I bring these points of view, not to start an argument, but to reason why this particular bolt does not have an accepted specific style and measurement.