I agree with a lot of the previous comments that these cars never come up for sale publicly (and only rarely privately). As for ballpark valuation I personally know of a restored matching RA II Bird 4speed coupe that sold in the DEPTHS of the recent deep recession (March 09) for 180K. It sold in two days with only a handful of people even having a shot at it. I bet 200K+ for that car today, especially if it went public.
Think hens teeth.
BTW I just posted this on the 67-9 thread that started 6 years ago and still gets action/postings.
This is from my recently finished Photobucket site for my matching 4speed RA II Bird.
'68 1/2 RA II Firebird:
http://s1232.photobucket.com/albums/ff374/mcjaxon/RA2/
Password: "RAMAIR2" (case sensitive)
I don't get back to PY much so if someone has a follow up question
[email protected] is probably the best way to get a hold of me.