Couple places just dawned on me...

Chuck's Auto Service on O'Neil Blvd. in White Oak. One of the mechanics has a couple of Chargers, they always have a steady stream of old cars in and out of there when the weather is nice.

The Meineke on Walnut St. in McKeesport, near Auto Supermarket and Tri-Star Ford. They have a '70 Dart in there right now they are fixing up for someone.

I've also seen some older cars being repaired at J&K Amoco, across from Chuck's Auto Service. I don't know if they do alignments though.