[spudder]

Some of the van tilt columns have a slot for a neutral safety switch, some don't. I just converted one for a friend and had to relocate the switch further up the column. I milled a slot up 6 inches from where the column goes through the firewall. You also have to drill a hole in the inner shift tube for the tang on the neutral safety switch. Be sure to accurately mark that hole in relation the park position of the shift tube. Critical for park and neutral starting. There are two screws that hold the switch to the column. The switch mount is slotted so there is a little adjustment possible.

The '67 C10 method uses a stamped "peg" to hold the column from slipping or rotating in a clamp that holds the column to the dash. 64 shortbox added a peg to the dash to hold his column. He added a corresponding hole to the column. for the peg to rest in. You can refer to his pictures to better understand how the column is secured.
Hope this all makes sense!