So with the engine out I disassembled it and started checking things as I went. I didn't find a whole lot until I started measuring the clearances. Upon pulling the pistons I found that all the top ring groove clearances were way out. I couldn't find a spec but .055-.085" top ring groove clearance has got to be out of spec. Then on pistons 7 and 8 the top and second rings were broken. Surprisingly or luckily no cylinder scoring was evident at all. Dodged that bullet.... So, it was evident that this engine suffered one heck of an overheat to sustain that much damage. Being a Powdered metal Rod engine I checked the rods for damage and straightness. They all seemed to be OK. So on to the cylinder head strip down. I pulled a couple of intake valves and they looked pretty rough. Then I pulled the injector cups and found some more evidence of the overheat damage. The coolant passages were sure enough cracked in the intakes of both cylinder 7 and 8. I posted a question on here to see if everybody agreed with me that these cylinder heads were very heavy paper weights. We all agreed so now it was time to search for some 7.3 heads that weren't a small fortune. I found a set down in Biloxi Ms, for hundred dollars each. So a road trip with my RiffRaff injector cup puller and I was off. They both checked good so we were on the way. So once home I stripped them and checked them for any other damage. They looked pretty good except for valve wear. The intakes on these 7.3 engines seem to get pretty beat up over time.