If you really want your truck to ride like a modern car, then fit a modern front suspension clip, but there's no need to do all that work just to make your truck drive properly.
I still have the straight axle in my '50 1/2 ton. With rebuilt springs, new king pins, spring shackles and bushings, there's no slop or wander, it rides dead straight at 70 MPH on British Motorways (Highways) and at 80 MPH (130 KPH) on European Autoroutes. As well as re-conditioning the axle I have put some simple upgrades on the front end; sway bar, disc brakes and the CPP Sagninaw power steering conversion.
Good luck with your truck whichever way you go, Stuart.