need help iding converter..

ok bought a 360/727 combo pulled the trans off to make it easier to move around and the converter doesnt look stock..partly because it has the date of 01 on a tag on it and it is balanced. the other numbers on tag were 5423ls i searched for that number and it brought me to transtar website.. but im not sure..can anyone help me with the specs? the motor came out of an 85 truck and has a 4 barrel intake on it.