ignition switch

[Timmy'sZ]

DOES ANYONE KNOW HOW TO CHANGE A IGNITION SWITCH IN 79 Z?

[chevymania.com]

The electrical portion of the switch or the lock cylinder and keys???

The electrical portion is on top of the steering columb under the dash. It's held on by either 2 5/16 or 11/32 bolts.

The lock cylinder requires you to pull the steering wheel then remove the lock plate, you need a tool for this, and the unscrew and remove the blinker assy.
After that it's either a philips or torx screw at about 2 oclock in there or a thin flat hole that you have to depress a tab to get it out.