Well the spindles are not going to work. Way too much interference with the tie rod mount and the rim.
So springs it must be. The truck has about 65k miles on it and it's 37 years old. Rear springs are new with a 4 inch drop. As it sits, a 3" drop in the front would even out the edge of the wheel well front to rear. However, the front has the original springs. If they have worn to the point that they are sagging an inch from stock, then a 3" drop spring would only net me a 2" drop.
How much sag would the original coils springs have now?