You should be able to pick up a new uper control arm pretty easy? Depending on where you are, and or who has the parts... (both of these fellow Firebird guys should have them?)
Check with Bill or Terry
Bill - FirebirdBill - EarlyBrds@aol.com - Ohio
Terry - 69Firebirdman - youjincho@prodigy.net - FL
They should be able to help you out, and since you have it apart, now is the time to replace it.
Good luck, welcome to the list, and let us know how it works out!