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I could be wrong but I believe I read somewhere here that the head studs themselves only need to be about 10-15lbs of torque to properly anchor them into the block.
But please get confirmation from a second source.
The nuts on those studs you already know 90-93 lbs.
Just snug them into the block...basically light hand tight. There is no official trq spec. Technically, they should be put into the block unloaded, but a little snugging isn't a bad thing.