In my experience, you won't need an alignment after front control arm bushings. Or at least, you won't need one any more than you need one NOW, and if it's been over a year, it's probably due for a check anyway.
The rear bushings, if bad, can affect the tracking of the rear axle, and therefore the center thrust line of the car. That usually screws the alignment up a little but again it would be more likely to be off now, and closer to correct when it's fixed.
Note that front ones can be done with basic regular tools- rears require special tools and spacers to keep from bending the ears on the rear axle housing.
Good luck!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 234K, '82 245T/M46-182K, '89 244DL/AW70- 212K Not too distant past: 86 244DL 215K, 87 244DL 239K, 88 744GLE 233K, 88 244GL 147K, 91 244 183K