Brad, where are you staying at Essex? We'll be there the 14th-18th.
I've never had any luck getting a mooring at Block. Last year a friend told me if you speak to the harbor master you can rent private moorings, but you need to be ready to move around if the owners come back or have given permission to friends to use them. We always anchor, I generally stay close to the harbor entrance to the left when coming in. It's a longer dinghy or launch ride from there to get in to anywhere, but usually a little more room to maneuver. I've never had problems holding, but have had some close calls with other boats that dragged anchor drifting by when the wind picked up.
John