Depends on what year B body as well.

there is no one chart that covers all years.

Ball and trunnion transmissions will use a different gear than later transmissions, so a 64 B will NOT use the same gear as a 68 B for example.

Then the even later transmissions with the plastic pinion adapter will use a third type of gear, but I forget when that went into effect.

None of the three different gear styles interchange, though you can swap the second and third style as an assembly with the adapter and speedo cable.