Saginaw 600 steering box in '70 truck?

[davepl]

A couple of years back I upgraded my '69 Camaro to the new Saginaw 600 steering box, which is what I think they use in modern Escalades and so forth. Great steering feel, much more like a modern car.

In any event, I'd like to do the same in my 70 GMC 2500, but can't find anyone offering an upgrade kit. I'd like to be sure (a) it'll fit and (b) get the correct metric-SAE adapters and so on, so I'd prefer a kit rather than trying to put it all together myself.

Anyone here running a 500 or 600 box in their truck?

Thanks!
Dave