YEAH!
SUCCESS! Arrived at Paul's today after driving about 50 miles, and obviously running the engine for a while with additive in it did the trick!
She's bone-dry underneath, got back home after another 50 miles and checked, DRY!
Ran at about 180 degrees there and back, no water missing. Did about 75 -90 mph on the way home - no issues.
The sqealing came from my second bad alternator, which Paul noticed right away, got a new one, Paul installed it and she's a nice little driving car again, just idles a bit high. All she needs now is a new coat of paint.
Much obliged Paul, you're awesome!
\D