You will have different shifter bodies and different handles. Wheras, you may have the correct body/base (brains) and have the incorrect handle (chrome)
I am not a second gen expert, but I believe some came with Muncie transmissions and some with Borg Warner.
Are we dealing with a First Gen Firebird that this 455 is in? What year, and what trans. If I have this, I can set you up with the correct shifter body, handle and linkage.
If you get me the main case number on the side of the trans, that will help. Also check out this..