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Have you contacted Tri State Mack? They are the local Navistar dealer. The 6.0 is a Navistar engine. It is not real popular and like you found out, not many mechanics want to touch it.
I know its way late, but there's a guy located in Flora who does good work on 6.0's. We have had all of ours worked on by him. PM me if you still need the assistance.
Hope you found someone by now but if not:
Bailey Automotive Repair Inc
3875 Wynndale Rd, Terry, MS 39170
Phone: (601) 878-6766
John Bailey
They work on PSD 6.9, 7.3, 6.0, 6.4, 6.7, Cummins and Duramax. John has the Ford computer equipment. My 2012 6.7 was the first on in his shop. Out of warranty and parking lights would not turn off. Diagnosed with computer, replace BCM and reset.