Steering setup

[chevyhed53]

I'm about to begin work on replacing the old, original steering couplings (see photos). I have a '56, but the front end setup is from a '71 or '72. At the moment, all I know is that the shaft is a 3/4" DD. Won't know spline count etc. on the steering box end until I take everything apart. I'm hoping to be able to replace that old bell-coupling with a simple U-joint, and since the box is in good shape, I will be swapping out the rag joint for a new replacement. Any tips or suggestions are appreciated. Thanks!