I am in the market for a 911 coupe & have come across a real 1970 911S with steel RS flares added, as well as fibreglass RS bumpers and a fibreglass 'ducktail'. Older RS 'spec' engine built by a well-known engine builder (with the correct MFI). I don't think the engine is based on the original 2.2 case. Rustfree, but a so-so color change paintjob. Interior ok, but missing door pockets & has a later stereo installed. Definitely not a show car, but supposedly solid.
How do I go about assigning a value to a 'ba$tard' car like this. Seeing as the engine case is no longer original (even though the replacement engine is an 'upgrade' on paper) would there be any additional value assigned to the S VIN versus a similar car that began life as a T?
The owner is considering offers, but I would assume, as always, that he has some figure in mind. What would a reasonable price range for something like this?