Do you install the cylinder the same way you take it out just backwards?

I suggest you do a search on this site, plenty of info here for it has been covered 100+ times here.:yes: http://www.chevelles.com/navbar/navbar_b10.gif

Is your ignition lock cylinder in the dash? (1964-1968) Or is it in the steering column? (1969 and later). Do you already have the lock cylinder out and are just trying to install a new one?

Need more info.
JIML82