Eldon's right on the money. The C narrow front uses a gear box with a reverse twist on the worm gear because the steering arm goes up instead of down like the wide front uses.
You also are going to run into a problem with the front steering mount. It's very different for a narrow front. I know a guy in WA that's looking to restore a C to narrow front and has the wide front setup. He has the front axels but needs the radiator mount/axel support for the narrow, he has the wide front style. I'll hook you up and you two can swap parts for the freight, if you're interested.