I don't buy into the temperature sensitive field coils. There is a whole other issue going on with so called hot starters not working. The weight issue is the large cast iron field case and large armature! 168 tooth flywheels measure 14".
My first 73 was bought in 1984 and it had a Emblem. The emblem was wrong but it tells me that stuff got changed early. I don't believe the tall spoiler ever had a emblem. I am probably wrong but it makes no sense to have a Emblem on a 71 and not a 72 73.