They did... a lot. I had a blown head gasket. I didn't want it to sit my garage for months, so I outsourced: brought it to a shop around town, they recommended shipping it to Iron Pig. I dropped it off in May. They did head gasket, machined the head and valves, cleaned out caked oil ports, thermostat housing, injectors, air rails, TPS.
It was a 1000 dollars for the 62, so dropping 4600 on repairs is fine (a lot of little things added up, like 20 hours labor, and I think they were being generous/conservative).
The experience was overall good, although there were points that I almost gave up hope that it would ever get back to me. Communication could have been better, if I didn't call I might have never heard from them, but when I did, the owner would give me tons of information.
Got it home, there was still some smoking, but it seems to have just been residual from the HG and repairs, no smoke at all now. It runs great, idles great. I think I would recommend them, just need to set your expectations time-wise, and don't be afraid to 9 them, or text back to the repair texts.