Here's what I know in addition to what I mentioned above:
The paint job is supposedly a 10K show room deal. Was taken down to base layer (not metal), water sanded, buffed, 2 coats of Nathan primer, etc.
Bottom has been cleaned up and painted. Engine bay and trunk painted. Trunk has original splatter paint.
New truck pan, new quarter panel. No rust.
Hood is a functional ram-air.
Power steering, power drum brakes, No AC.
Power remote driver's side mirror.
The back was blocked to level the car.
New carpet.
Factory 10 bolt rear ned.
New bumpers from Year One, front and back.
The engine block reads "YR 481990", which comes up as a 72' 350 I think. The heads however date as being from a 400 and from 67'. So the engine is def not number matching. I would have liked numbers matching but it wasn't a requirement. No idea what the estimated HP is. Car does run and sounds smooth.
Flowmaster dual exhaust with headers.
No back seat but he'll throw in a 68' Camaro one.
He has all of the original badges and wheel trim, just hasn't put them back on after paint.
He originally bought it off a friend and was going to make it a 25K car (hence the body work and paint job). He's got 7 other re-builds going though and was worried about the niche Firebird market. He also wants a lake house and decided to stop where he he's at and make a quick sale.
I have another 5K available to put into it right away. After that it will be restored over a longer period of time.