flywheels : Group Number 0.666
There were different flywheels at least for 6v and 12v, for different clutch disk sizes, for Powerglide, for . . . .
If this is a quiz, there were about 10 different flywheels for 235s on 41-57 cars and trucks (and, I bet that there were not many additional, different flywheels on 235s from 58-63).