Alignment problem

[sloth454]

Hey all thanks for the help in advanced. So ive got a 72 C20. I rebuilt the front end, used the original control arms with new bushings, did all the ball joints, ect. My problem is I'm running a 255/70R16 tire, I personally have done the alignment and another guy has done it after me. When I am turning through a corner/ turning around in a coldasack/ U-turn. The tires scrub and hop like as if I was in a 4x4 that's locked in. Any advice and help would be great. Just looking for ideas so I can stop burning up the outside edges of my tires.