Hi mate.
That Twinpower SW8000 is a cracking reel and can be fished pretty hard.
Line-wise, and there will be guys who reckon this is too heavy, I would load it with 50lb because, if you hook that metre plus king, you'll need all of that to get him in especially of you are near structure which, 90% of the time, you will be. I would use a 60-80lb leader depending on territory.
Rod-wise, the T Curves are using ordinary components (Pac Bay) these days and the blanks are really chunky. Just when the factory rolled rod world are slimming down and getting great performance out of slender blanks with good (Fuji SIC) components, Shimano have gone in a different direction. This is a huge disappointment. I would look at the Daiwa range and in particular, the Saltiga Coastal or S-Extreme. Alternatively, there are some great rods from Nitro Innovator. For me, the perfect King rod is 6'6" to 7 feet long, has K series Titanium guides and a short butt set up (preferably not a split type arrangement but this is hard to avoid these days)to enable you to get it out of the rod holder quickly and easily.
I use 6000, 8000, 10000 and 20000 reels on Harbour and Inshore Kings with regular success. Fish that drag hard. Screw it all the way up!!