What are the major differences between A904 and A727?

i am going to build up my /6 A904 to go behind my turbocharged /6.
been talking with a guy on the slant six board that successfully upgraded his A904 with a drum from an A999 to gain 5 clutches in the front and 4 in rear. along with other modifications. buddy told me that the torquefilite A727 transmission handbook by Carl H. Munroe helped him out a lot. So i purchased it. I've also downloaded the 727/904 pdf manual floating around.

my questions is in the title. what are the differences between the two models? or similarities? the 904 sure doesn't have the same information trail the 727 does for obvious reason. thanks in advance for your input

Where can I access the 904/727 pdf?