New springs and there is someone making a coil spacer. Springs will get it up so it sits like stock, and get you full suspension up-travel, but to get it to sit level (and it will be nose-up when loaded) you will need to add coil spacers.
Someone on the DTRF did just that, and the truck looks pretty good.
While you have it apart you may as well at least replace the lower ball joints, too. You can do it without a spring compressor, but be careful, you will need to support the frame, then use a floor jack to lower the lower control arm slowly. The upper joints take a special socket, I'd get the MOPAR tool # if my manual wasn't up in the shop. The lowers press out.
Ball joints are not a good place to cheap out if you like driving it and not working on it. Moogs were the best you could get but their quality has really fell off recently, now TRW seems to be the brand to get. Oh, and give them each a shot or two of grease every oil change. I think what takes out the lower joints is the uppers going bad, which allows the lower to move more than normal, and a lack of grease.
If it leans to the left, you will need new rear springs to get it sitting level that way, too. 30 gallons of fuel, plus driver, over 1/4 million miles or more, can really wear out the left side springs.
A factory service manual will help a lot too. Haynes manuals are just about a joke.
Another leveling option is a concrete bed liner. It will ride better, too.