Ive retorque a couple of head gaskets on a 104 engine, with good enough
results , probably due to non original gasket installed, my engine was leaking a lot and i didnt want to do the headgasket yet , it significantly
slowed my leak,i did loosen 1 bolt all the way at a time ,then torque acordingly with the2x90 degrees final, cant hurt anything , worth a try