The thing with the battery cables is that there is substantial current draw during starting (starter motor turning the engine over, spark from the coil, etc). Either a 0 or a 1 AWG (Wire Gage) cable will work; 12 volt type cables cannot carry the current the system will draw.
I would suggest you verify this with Charlotte Dayton but my recollection on the standard is that the NEGATIVE cable is the 0 or 1 AWG type with black rubber insulation (casing color) and it should be available from a good tractor parts place (they were used on older Allis-Chalmers, John Deere, etc). The positive ground off the battery should be a ground strap (again, the tractor place should be able to supply this) that mounts to the bolt that holds down the engine on the driver side. The Kaiser-Frazer service manual for your particular car should show how this goes if something has changed on the car over the years.
What do some of the more mechanically inclined think of these thoughts? It's been a while since I've had an old car to tinker with.
