torque converter

My tranny has A-727-A stamped on it, I guess that I need a T-C for a 318/727 combo? I also looked at my 904 which said A-904-LA, the letter for the poly 318 is A. So its a 318A, the last A on the 727 may mean the 318A engine. My engine that Im using is a 318LA so the last letters on the 904 is telling us what engine again. Maybe my 727 wont work, its just a thought.