[racer]

It has the greatest value if kept with the car it came from the factory with.

Not many folks looking for an l-Jet 2.0L 914 motor. Even 914 guys aren't "that" interested in it.. but if complete and in good running order you might get a couple of grand?

You could also have it rebuilt by someone like Jake Raby into a 2056-2270cc or larger (120-160+hp) engine.

Given the age of the car and their relative scarcity (only some 2100 built, with many having since been "upgraded" - like yours - in pursuit of 911 performance on the cheap) if your 912E is mostly original, you might get more by selling the whole car and getting a different "project" car.