The vehicle will need a 4 wheel alignment. Front wheel alignment is based off of rear wheel straightness. When doing an alignment you must always do the rear adjustments first, once those are straight, then the true readings for the front are indicated.
If the wheel was straight before, chances are the machine will SAY the front is incorrect as well as the rear, but once the rear is corrected first there is a good chance the front numbers will move back to straight without even touching them.
And whether dropping the craddle or just unbolting a few control arms, once the tension on the arms and bushings are released by the bolts, things shift. The proper way to tighten suspension is to have load on the arm and bushing before fully tightening. Most dont do it because its a real pain on the ground!
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2009 Pontiac G8 GT
2009 Chevy Cobalt SS
1986 Buick Grand National