Super C should have an ammeter and distributor. You are only changing the charging source, not the ignition or starter. With Alternator you must have negative ground.
1.Remove generator and regulator
2.Follow Old's advice and use a 3 wire alternator
3. Connect BAT wire from old regulator to output stud of alternator. If it has an L terminal on the old regulator connect that to the output stud also. It would be a good idea to replace wire from alternator to ammeter and from ammeter to starter switch where battery cable connects with a 10 gauge wire.
To change from positive to negative ground, reverse wires on ammeter, reverse wires on coil, install battery negative ground
4. Either add a 1 1/2 ohm resistor in series with original 6 volt coil, or replace with direct 12 volt no resistor required coil such as NAPA IC14SB or equivalent. These coils are wound with different wire than a 6 volt coil, they do not have a series resistor inside the can.