Question:

I recently purchased a 66 Chevy Nova. It starts without the key so I got a new key lock but I cant figure out how to disconnect the old one given the small amount of space under the dash. How do I disconnect the old one so I can actually make it so I need a key to start my car?

 

Answer:

Put the key into the lock assembly and turn it all the way to the left (counter clock wise).  When it stops, use a paper clip and depress the button on the lock through the tiny hole on the front.  This button releases the lock and allows you to replace it with a new one.