I found a workable front bumper and a valance on EBAY a couple years ago I'm going to use for future mods. Also there's a company that was remaking bumpers with your core also.
You could check the for sale ads and place a wanted ad on
http://www.transamcountry.com/ , a 2nd gen TA/Firebird site.
Exactly what "nose" parts do you need?