On a Huck Brake/Bendix swap, there may be no need to even swap spindles. All you do is drill out the top two holes on the spindle to 1/2" and bolt on the later style brake setup. I'm fairly sure the 3/4 ton would be the same. There's an article in the Tech Tip section on the subject.
Maybe all you need is a 46-52 8 lug hub and wheel spacer.
