Gas struts / shocks / shox rule.
If you want a bolt-in kit, do not pass go, go straight to camp914.com. Premium quality vendor, and a very reasonable price.
At a local swap meet, I intended on buying the camp914 kit. But they were out of stock. So I happened to be at a local pull-a-part wrecking yard and scored the parts I needed for a grand total of $7.00. Had to do a little cutting, welding, fabricating work, but it paid off. Posted a
lackluster thread about it a while back.
Removing the old tortion bar system can be fun. Don't know where you're at with that. But for sure, the gas shox solution is great.