Right Clutch Pressure Plate?

[Nico73]

Hi Brian,
at The early_ford_store of CA i found a 9" pressure-plate with 9 springs,
its item Nr. 48-7563.
That's make me thinking of, do i have enough pressure on the plate with only 6 springs
for the weight of my 1 1/5 Ton Truck?

How Big is the difference between 6 or 9 Springs in the pressure plate?
Has any one expience?

Thanks, Nico