Two common mistakes that can affect ride height come to mind when front suspensions are rebuilt:
1. Front springs not seated correctly - only the TOP end of the spring is to be seated, in the frame pocket, as shown in the Assembly Manual. Some folks locate the bottom end of the spring at the hole in the lower control arm pocket, which is wrong - that hole is only for water drainage.
2. Upper and lower control arm bushing bolts tightened while the suspension is hanging at full rebound, which binds up the bushings and makes the car ride high; those bolts are to be tightened with the car on wheels at normal ride height, so the bushings remain neutralized and unstressed.