What do you want to end up with when you are done? You could spend anywhere from $10k to $15k for a full restoration.
'69 firebirds never came with a 326, that was '67 only. Your car likely came with either a 350 or an inline six.
If the car currently runs and drives, 2500 is kind of a going rate. If the car and drivetrain is all in pieces, that is likely a bit high.
Posting pictures of the vehicle here would help a lot. You can also order "PHS" with the car's VIN number and have a printout of how your car was built. Go to PHS-online.com and check that out. You nedd to be very careful about rust. Any car that has major rear quarter rust and inner front well rust will likely have tons of additional rust. A lot of hidden nightmares can be found under a fresh coat of paint or primer.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold