I know 40 k seems like quite a bit for a 13 yr old Vette but...
*It is a Callaway w/ low miles...
*VERY rare automatic trans
*It is a "triple Black Callaway"<desireable
*It has the correct wheels

*The Aerobody, although not "correct" for an 88 it is however, a Callaway Aerobody -vs- an add on kit... (It may not add a lot of value BUT IMO, it takes nothing away from the car)$$$$$$$<BIG>$$$$$
*It is a Convertible
This may be a decent deal considering that Stoudts has a Red Aero car w/ OZ's on it and they are asking 43k w/ 12k. It is an 89 6 spd convertible however, in 89 you cannot get things like sport seats like you could w/ a stick convert. in 88... (or an automatic in 89 either)
The 89 for 43k is red w/ red guts and a white top... I personally drove that car when the past owner had it and I could not get past the red interior, OZ's and the lack of something else in the glovebox...

hope this helps, just my 2c worth

*89x2*