It's not bolt-on, but pretty close- - - -try a power steering box from a Toyota Land Cruiser. There will be some adapting required where it mounts to the frame, and you'll need to fit a steering pump to the engine, but it's probably simpler than using a boost cylinder from the frame to the tie rod and a sensing valve grafted into the drag link. The 82 Corvette with 9500 original miles that I inspected a couple of weeks ago had the boost cylinder steering setup, but the sensing valve was built into the Pitman arm at the steering gear.
Jerry
