For kingfish, you'll want to find a conventional reel that's comfortable and provides a light drag with a high gear ratio.
PENN Torque reels with a 6:1 gear ratio are a great choice. A fast reel gear ratio allows you to pick up line quickly. Setting the reels to a two to three (2-3) pound drag keeps kingfish from breaking off. A good reel clicker is a great option too, it allows you to hear the kingfish strike. Another advantage of a reel with a good clicker is that the captain will use its noise to chase the fish; closer or further to boat based on clicker speed.
The combination of a powerful reel with a light drag and line makes for a killer Kingfish setup.