340 head torque requirements

Want to thank everyone for their input so far. Engine building has become a big lesson, to me anyway, since my younger years. Have learned to degree a cam, cc my heads to calculate my compression. Cam selection has been somewhat of a lesson. Not sure where I stand on it. Time will tell. Have checked piston to valve clearance. All that is left are the custom pushrods. Will see how that goes. Again, many thanks to all of you.