Nice looking-BUT- $40K for a 289, no PS, no PB, no AC.
The rear shackles indicate worn/weak rear springs & shocks, which would lead me to believe the front suspension is also worn out.
I would suspect that the $40K is influenced more by sentimental value rather than condition and market value. (I would start at $20K and negotiate downward from that value. But that's just me.)
Neil