Need Help to ID My Engine

I have a 59L, factory relieved block that also has sleeved cylinders (don't know if that's factory or not) and the numbers stamped into the bellhousing are: 5 H14622. Any idea what this came in originally? I was told it's out of a big truck. A friend also has a factory relieved block but his doesn't have a number cast into the bellhousing, where would that have come from? Thanks,

Rich
 
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