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Read through this thread and see if it helps.
http://67-72chevytrucks.com/vboard/s...d.php?t=545110
Here is another one
http://67-72chevytrucks.com/vboard/s...d.php?t=526205
And another.
http://67-72chevytrucks.com/vboard/s...d.php?t=380943
The way the ball mounts on the engine is different also. Some screw directly into the block and some have a bracket that bolts to the block that offsets the ball one way or the other... You can see them in the pictures
I know that the 6 cyl bell crank is longer than the V-8.
LockDoc