If you’re saying someone cut the torsion bars off and you need replacements. I think you’ll find it easier to replace the front suspension. Torsion bars can only be found used, and in many trucks they are frozen in place.

If you’re interested in swapping to the newer coil spring front suspension, this thread may prove helpful. It shows how I did the installation in my 1960 GMC;

http://67-72chevytrucks.com/vboard/showthread.php?t=366828

1960 GMC 1/2-Ton Pickup Truck
In the Gallery
Updates in the DITY Gallery
Now cruising in the Passing Lane