This is going to depend on what you are doing for ignition.
That is, with a Mopar or other system using a ballast resistor, the bypass circuit is taken care of in the Mopar ign switch. In a GM that function is in the starter solenoid.
so if you need the bypass function, you either need to use a second relay or an isolation diode off the "start" signal.
All other connections should be OK. All switches pretty much have battery in, "Ignition run," "start," and "accessory.
One last problem in some years switches is whether the "ignition run" goes dead in cranking. In that case, whether you have a coil ballast or not, you 'll need a diode or relay to jumper "start" power in cranking to the "ignition" circuit.
Get a test lamp or ohmeter, and "try" the switch.
The EZ harness I had already came with a GM column connector, so it "should" plug right in