Well the first thing I would do is never take it back to that shop. They should have known that the alignment requires shims. Some shops will charge you for those shims, but that's how you change the alignment on these cars unless you have adjustable control arms.
I'd call around in your area to the various alignment shops and verify that they are familiar with 60-70's gm suspension alignments and if they have the necessary shims to do so.
If you have more modern radial tires, shoot for a more modern alignment spec.
-.5* camber
+2-3* caster
1/16th toe in
On the caster, realistically you should shoot for as much as you can get out of the factory arms, especially if it had power steering. If it's manual steering going over 2* positive is going to start increasing how hard it is to turn the wheel. Most factory arms aren't going to allow any more than 2.5-3* positive caster.
If you're after a more performance oriented alignment, target 1* negative camber and 0 toe to 1/16th toe out.
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-Jason
1969 Pontiac Firebird
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