If you want folks to be able to help you, you need to provide more information and pictures. Is it an original 390 -- you need to check the VIN, fastback, coupe or convertible, rust and paint require much more information -- how is the underside -- floor pans, frame rails, have you looked under the battery tray -- is the bottom rusted out, etc. etc. etc. What options are on the car? AC/ PS/ Disc Brakes -- are they add on or original? Pricing these things is as much art as science and it is totally different from getting a blue book on a late model car. It is amazing the # of posts wanting to know the value of something with no information. The answer is between 101 (which has been offered sight unseen) and maybe 25 or 30,000 depending on the above -- less the cost of the paint and body work needed. Since that doesn't help much -- you need to fill in the blanks. Hope you join up and have fun in a classic.

__________________
1968 C-Code Coupe -- All stock except for a 20 yo repaint. Royal Maroon Maroon Interior / Bench <33K original miles
2008 GT/CS Convertible
Mods: FRPP Strut Tower Brace / FRPP X-Pipe / FRPP Short Throw Shifter (Hurst) / FRPP CAK & Tune / Steeda Ultra Lites / Tokico D-Specs / Steeda HD Strut Tower Brace / LCA's / G-Trac Brace / HD Adjustible Panhard Bar / Rear Sway Bar + End Links/Steeda Stainless Brake Lines / DBA Rotors / Hawk Pads / Webelectric sequentials/ one touch top /rear windows