Interior (absolutely love that red interior mate) and engine bay look very original.
How about the engine is it the original engine with matching numbers to what's on the chassis plate?
You mentioned a respray about 20 years ago, was it the original colour that it was resprayed with?
Will need some exterior pictures, but if she's as original on the outside as she looks everywhere else then mate I would honestly set a price of at least $20k personally and see what interest you get. Provided she's rust free and structurally sound. (will need more pics though).