Had to modify a couple of sockets so that the rear most head bolt could be reached with a torque wrench. It worked !! I used a 5/8 spark plug socket and a 3/4 socket to drive it with. Both were shortened with a band saw. All of this ensured the rear bolt could be fully torqued to 110 ft-lbs, along with the rest of the head bolts. 2 bolts required thread sealant, so they only get 100 ft-lbs of torque.
Here is the rest of the Knock Repair Series: https://www.youtube.com/watch?v=X7uHI24cXfc&list=PLCyDzy-NaUwIhZmxHzIv0SJRHACQRIjSx