you don't say :sarcasm:...because even the 7M had headgasket failures from inadequate torque of the head bolts
Actually IMO its the design of the head gaskets that are the problem in M motors, there's nothing wrong with the stock bolts. The stock torque spec is on the low side however, I went with 70lbs/ft myself.
If you're doing a rebuild, just go with a metal head gasket right from the get go, turbo or not. Its only a matter of time with the stock style gaskets, they're all junk, its a horrible design.
There's a fully rebuilt 7mge in my shop right now with 6000kms on it and a seeping Altrom headgasket (pretty much the same as oem toyota). Both the block and head were properly planed, very nice finish on them.