A blind landing is essentially a controlled crash, so you want to use the configuration and speed that will reduce your sink rate and forward speed as much as possible. It isn't usually best glide which is a high forward speed. It also isn't slow and dirty, which can produce a high sink rate. For most airplanes, partial flaps at about 1.3 x Vstall is the right configuration to use. Keep the gear stowed and run the off-airport checklist. You will not know when the ground is coming, so abandon best glide as soon as you know you are landing in the dark.