Need straight info about drop spindles

[WinDancer]

To put this to bed, finally
I was able to use the 71/72 spindles and just swapped out the ball joints. Wes at Classic Heartbeat took the time to go look at the truck and them match up the ball joints and deliver them to the mechanic.
I picked up the truck yesterday and it now clears our access road without dragging the full-sized headers on the rocks.
Thanks to all!