Inconsistent veering

[Wildstreak]

I have a 1971 chevy k10 and recently got it back on the road and it seams to veer inconsistently, it can drive straight for a few miles then it decides it wants to go left then right or right then left, its very unsettling. I know it drove straight before I replaced some things but i cant figure out what is causing the veering. I replaced spring bushing, ball joints, drag link, rag joint and the steering box. As far as i can tell my tow is still in place and everything is straight, and theres zero play anywhere. I may have over tightened my steering box when doing then adjustment, could that cause this? Any ideas on what could be causing the inconsistent veering? any help is appreciated!