I have a friend who runs a repair shop, specializing in Diesel.. I would guess he's done 12-15 6.0L's in the last 3 years..
He raises the Cab off, to get at engine..
There's always a Ford sitting waiting for head gaskets and head bolts
The guys are correct the 7.3's are good ...
I took a 2013 black reg cab dually to Line-X yesterday 42 km on it awesome driving truck... not as nice a Duramax with Allison