This would be a good "lessons learned the hard way" thread.
I have a 72, with a 4/6 drop, turning into parts truck, and a 67 almost done truck. I went to take off the lower A arms as the have a 2inch lowered spring perch. I couldn't get the ball joint off and resorted to buying dropped spindles for the 67.
When I took it to the shop, the guy said I could of disconnected the top of the spindles, brought it all in and he would of seperated it...... $200 later
I do plan on putting them on sometime in the future. That way I start with a 4 and half inch drop and can order springs in 1 inch increments (I think 5 inch would be about right on the front of my truck).