The replaced engine being non-original model (3.0L) would probably hurt the value for most people, just because they don't understand, but in all I'd be happy with the car for $4k, another thousand for a nice paint job and you have an excellent driver (if the mechanical was done right). Is there documentation on the engine/driveline work? From a reputable shop?

I don't know about '90, but in '91 ASD and SLS were available, IMO both handy on the SDL.

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Gone to the dark side

- Jeff