Well in 1962 I could start up a Chevy and drive off with it with nothing more than a single wire from the battery to the coil and a screw driver to jump the starter solenoid. The snlgle wire is the bare minimum you need.
The 454 is not a standard engine for 62, so I would guess your running HEI instead of points and probably an alternator instead of generator. For these things you may need to look at a late 60's impala wiring diagram. Maybe some of this will help.