I have to post a disclaimer first here...
I am not trying to argue the point here, but to the best I am informed and trained I have to tell you something about your car
Bandito. Please understand I just want to inform, not make any decision for you. Now that we are on the same page...
I'll start with a question - Who has told you that the car has no "frame" damage? I must be clear here, there is no frame under your Firebird, or for that matter, most any other car on the road today. Modern vehicles are constructed using a bunch of stamped steel welded together to form a "unitized structure" or more commonly known as unibody. This structure has components including floorpans, pillars, rockers, aprons, core support, rear body panel, and rails among others. The unibody is the supporting stucture that the body panels and drivetrain bolt onto. On a car that has a "frame" you have a load bearing stucture that the drivetrain bolts onto, then a body placed on top.
Since your is a unibody, there is no "frame" to damage, only a "structure" as defined by manufactures and the NHTSA. There is a national set of standards set forth by the American Association of Auto Auctions that dictates which parts of a frame or unibody vehicle must be damaged in such a manner that threatens the integrity of either the platform or it's performance in future collisions. These conditions must be announced at wholesale auctions and greatly influences a car's worth, not to mention it's crash worthiness.
Judging by your pictures(and keep in mind I do this for a living) the car has unibody damage. The left apron in the 4th pic is shown to be crunched severly. Fourth-gen fbodies have front rails that have crumple zones(manufactured weak points in the structure designed to absorb impact and save lives - good for you, bad for car) that extend in front of the core support, and I feel sure at seeing the extent of the total front damage that those rails have done their job and sustained damage. By AAA standards, frame or unibody structual damage applies to current or repaired, since the OEM crumple zones cannot be reproduced. That means even if you do repair the car, it will always carry this label and the scars to prove it.
What about the frame machine that I mentioned in the other post, you done that or heard if it will be done? Manufactures have tolerances to how the structure should be shaped to maintain crash- and roadworthiness. The car is loaded onto the machine and attached to a measuring device at predetermined points. I feel convident in saying that your car has received sufficent distortion or the front end to throw many of the measurements out of tolerance.
As for your question, I stick by my original response - wash your hands of it and buy a newer, better 'bird.
I know this may not be what you want to hear, and I hope I haven't offended you. I just try to call it like I see it.
Either way - Good Luck!!!