With the help of Chris (Capt Kaos), and the future help of Ken (kiilew) and Mike (Swerve), I put together a year by year list of the differences thru the 73-87 model years.
http://www.73-87.com/7387info/7387differences.htm
There wil be more added as Mike and Ken get back to me, and if you see anything you think should be added, feel free to contact me so we can get in on the list. (Cough cough...Joe, Dave & N2trux...cough cough)
Hope you like it.