Give Kent's Diesel Works a call.
434 W. 3rd Ave.
Mesa, AZ 85210
602-844-9591
Kent's just did a bare block overhaul on my buddy's 87 F250, 6.9... full set of sleeves, did the heads, crank... installed a turbo kit from Mel, as well as a bunch of drive train stuff to get the truck sorted properly.. all quality work, fair prices for the quality of work, but not an "economy shop" so be ready. Kent refuses to do work that is less than quality. If you ask him for a "patch job" he will send you away. My buddy doesn't know a nut from a bolt so he ask me to keep an eye on the work progress. Always found everything done exactly right and right by the numbers.. He spent a bunch, but got a really good engine built, even down to having a special 5 core radiator built for the truck.
Shop is Very busy... so expect to wait to get a slot to get in. He does large commercial trucks as core business and those customers take first place since their incomes depend on getting their trucks back in service.
Good luck