I dont think you will need an alignment as long as the steer box was in good condition and has no slack in it you should be fine. If I were you and it has not been done, I would get a kit to renew the idle arm bushing while you are doing the job. Easy job and makes a lot of difference when renewed. Cheap bushing kit, $20-$30 and less than a 40 min job

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red