well, Ive answered my own question with this helpful link

http://www.allpar.com/mopar/torqueflite.html

Basically - there is a case difference - 727-a is the small block version case and the 727-b is the big block

Anyone got a small block version they would be willing to trade for a big block version? I have done some vlve body work to this unit and played around with it in my 66 plymouth/big block before taking that car off the road for awhile.

Lemme know,

thanks!