How Many Front Planetary Pinions?

You don’t need them until over 600 horsepower. Now there are 2 planetaries in a 727 and the front is more common than the rear in 4 pinions. All BB 727’s do not have both 4 pinions. Only 440 HP, hemi and some truck & motorhome. 383’s don’t have them either.

you cannot just swap in some planetaries, there are different spline angle on the output shaft depending on year. I don’t have the breakdown on that but beware of it when swapping.

I don’t know what a 340 has, but since it is a small block and not as much torque or weight as a 440 car it may not have them at all.