arm swap for disc brakes 60 chevy

[bigblackcat]

I have a 60 chevy swb box and would like to install disc brakes. As i dont have a mountain of cash to throw at this project, I want to keep it low buck. In a post by "mongo" he reports that all you have to do in swap out tha uper and lower A arms and spindles off a disc brake truck say 71 and newer. I has seen post that claim you have to swap out the whole cross member from the donor truck. Has any body out there completed this swap with just the A arms? And has any body done it to a 60 chev? The 60 chevy's have the torsion bar suspension.