67-68 383 ,68 340 and all 69+ Use the 727 yoke, 66-68 /6, 273 and 318 833's use the 904 sized slip yoke and a different tailshaft housing, I'm talking about A body 833's so that may be part of the confusion, all B&E 833's use the 727 sized yoke.
I didn't know there was a difference either until I got my Dart which was a '68 273/833 car, it was real fun finding a tailshaft seal for it because the O.D. of a 904 seal is about .200" larger and will not fit.
