The GMC steering colum is not the same, the turn swith is different and no one makes it. you can get that part for a Chevy Truck, but not GMC.
Also the rear suspension was changed from the Torsion bars days, (1960-62) on the mater model trucks, so you best check it out good to see if it will even work. BTW GMC switched to leaf springs on the rear end of their truck in 1963. You may need to find a 63-66 Chevy truck for rear suspension parts. GMC also used a different rear axle then Chevy and the brakes are harder to find, as they are heaveir then Chevy and most parts stores only have the numbers for the Chevy trucks.
The really on parts you can use are some of the front end sheet metal parts.......
