The 4.0 pistons are being cleaned up in Chem Dip. AMC rod bearing number 3196697, looks to be std diameter.
Blog: http://rotordesign.com/jeep/
Here is the rest of the Knock Repair Series: https://www.youtube.com/watch?v=X7uHI24cXfc&list=PLCyDzy-NaUwIhZmxHzIv0SJRHACQRIjSx