Yup, I broke mine mysteriously and now I know why. The 360's were balanced as a unit with the torque convertor so if you dont have the original convertor, youll need the B&M and a neutral convertor from any motor other than a 360 or a late cast crank 340. 904's have a squarish pan with a corner cut off, 727 has a square pan with a little extra on a corner.