Value of 1967 with non-original motor
 

1967 911 normale, sunroof car with a 1977 2.7 litre, balanced and blueprinted motor (est 200 hp). Car has an outstanding original-color paint job (recent) and original color interior (also outstanding). No rust ever, CA car for most of its life.

Where would you expect to see an asking price of such a car?

sounds like a beauty even without original motor. I would venture its value to be in the thirties. It is hard to say though without a picture to whip me into a frenzy!