I just changed out a friends 85 F150 from AOD to C6.
The flywheels are different, I guess the center hub is different.
The shift linkage is different, the AOD lever points up and the C6 points down.
need vacuum line to modulator, and the kick down linkage.
Mounts up the same (within a 1/2")

He had the c6 in the truck, put in the AOD, I sold him my truck and we swapped the trannys back out so I had the AOD. We never changed the flywheel but they are different.
Hope this helps