47-55.1 Steering column height

[MidLifer]

My steering column seems low. When I reassembled the truck I bolted it into the frame in the existing holes. But as you can see there's at least a 1/2" gap where the collar mounts to the dash.

Should I stack washers between the steering box and the frame to raise it up? Or cut a shim out of steel stock? Or is there another way to get this to line up? I realize I need to put a rubber liner between the collar and the column but that will only add 1/8" or so.