I am assuming you issue was no charging.
You could take it to an other store and have it tested again. If both places say it is no good it most likely is no good.
Unscrew the 2 screws that hold on the Voltage Regulator. If what is left of the 2 Brushes is worn 2mm or less it the Brushes are worn out.
If the Brushes are worn you might consider replacing only the Brushes or the Voltage Regulator. Of course you would be taking a chance that the Voltage Regulator is the problem so you might spend for a new Voltage Regulater only to find something else is wrong.
Are the AC Delco Alternators ones that are rebuilt by AC Delco are are they new alternators?
Please remember this; if you buy a rebuilt Alternator have them test it before you leave the store to make sure it works. Along with the above, rebuilt Alternators often do not come with the Pulley. Have the Parts store remove your Pulley from the Old Alternator and install it on the New Alternator and have them test the New Alternator.
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84 300D, 82 Volvo 244Gl Diesel
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