Having both my engine and tranny done currently and the tranny is already finished minus the torque converter. Engine is stripped and they called and reported to me that the crank was a forged internally balanced crank, which I then reported back to my tranny guy so he could order the correct torque converter. He struggled to find a torque converter for a 1973 440 with an internally balanced crank and stated that the cast number on the 727 tranny I had goes to a 400 (the number stamped was 3732564 4290 9809) which then made me doubt I had a 440. Today I called the engine shop and they reported the casting number on my block (36988304405) confirming it was a 440... guess I am looking for some peace of mind if anyone has any!