Yeah, I find myself pulling on the wrench for all I'm worth while turning my head and squinting to avoid flying pieces of head bolt when it shears off into a million pieces. Feels like 200 lb-ft at least, but probaly not.

No angle gauge here, easy to hit 90 degrees pretty accurately with the inline six head.
But with that kind of bolt torque, it's important to follow the cleanliness and lubrication recommendations to achieve proper clamp load and even pressure.

DG