Good afternoon,
Yes, I would consider replacing the motor. The coolant in the oil will cause the bearings to fail. That would require an engine overhaul.
As far as the motor, try to keep it as close to the 96 as possible. The basic 6.0 block is the same for years but the worst you would have to do is change over the externals from your bad motor to the donor motor.
Go to www. Car-part. Com and they will list the yards and prices in your area.
Roy
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Sunday, January 17th, 2021 AT 12:43 PM