There appears to be about 2 inches of space between the coil pack and booster. That should be enough room to remove the coil pack. The proper length of extension in the spark plug socket should then be able to get the sparkplug out. Be sure to coat the threads with anti-seize, or the spark plugs will never come out again.
You need a universal joint in the drive of the plug socket you have and a short extension that puts the u,joint at the top edge of the valve cover, then you can put another extension on your ratchet and into the u,joint.
This gets you around the master and to the plug.
