Front end wont stay aligned

Bounce the front end while parked. If you hear the UCA bushings creak the cam bolts aren't tight enough. I usually weld around the K frame LCA pivot tubes, broken or not, just to reinforce the area. I MIG weld a bead completely around them and then grind it back til it's the same height as original so the LCA sits in the stock position.
When you realign it - which measurement has changed from the last alignment - caster, camber, toe? Also, make sure the steering box bolts holding it to the k frame are really tight. DAMHIK...