Don't rule out that each rotating assembly on the from of that motor has bearings in it -- P/S - water pump - A/C - Alternator....
Can you duplicate the squeal while parked and just raising the rpms of the motor - if you could - then you might be able to zero in on where it's coming from.
Don't over tighten your belts trying to eliminate the squeal - because that can lead to bearing failure.
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