spindle and center link?

[Leftlane]

Hello all,
I just read 50 or so threads using "spindle" in the search bar; but didn't really find the answer Sooo...

I'm working on a '71 C10 SWB with power steering.
Wanting to drop the truck around 4.5 front and 6 rear.

I already own a set of 1973+ 2.5" drop spindles and 2" springs.
It seems as though the ball joints and outer tie rods are the same for both years, so I should be able to physicaly mount the newer spindles onto the arms.
Does my '72 center link pose any alignment problems using the newer spindle?
Can I use the 73-87 2" drop springs in my '71 without issue?

Thanks,
Keith