[Shotimes] (OT) pricing an 83 Mustang

[van Oss]

I want to sell our 1983 Mustang convertible.  Obviously the usual websites 
(NADA, KBB, Edmunds) are not useful for placing a value on a car that old. 
The price guide at Hemmings Motor News is based on year/model and shows 
prices of cars that have sold in the last 60 days.  Hemmings apparently sold 
only one car, and $6250 is too high for ours.

Can you point me to other resources or at least give me your own assessment? 
152K miles, yellow car repainted green by PO, white & black interior, V6 
auto, newer tan vinyl roof.  Condition kinda rough.  No rust, former AZ car.

Any suggestions welcome.  Thanks.
VO