Update:
Fired it up again .... hooked up the vacuum modulator, let it warm up ... whine is gone.
While it was warming up I could I could unplug the modulator and it would slowly start to whine again, plug it back in and it would stop whining after a few seconds.
Still not fully warm ... say 100-105 degrees ... in Park, fluid shows at right between add one pint and full ... put it in Neutral and it shows half a pint ABOVE full.
Considering the pump is a "new" 35 year old part of unknown origin .... what do you guys think ... go ahead and pull it and replace before I put this thing in the chassis. It's not a real expensive part. Buy a full pump with shaft .... or the front half? I definitely would rather do this on the stand than do it later under the car.
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