'66 Valiant Factory Grounds?

Mine is a 64, but should be similar. It's a very original and complete car, so it should be a good example. It has the negative cable, of course, and only one large (6ga) ground wire from a bellhousing bolt to the firewall. That's all it had. These cars were no rolling electronics marvels, so they didn't need much. I did add an extra battery cable from the block where the negative cable attaches going to an inner fender bolt where the radiator support and inner fender come together just in front of the battery. I felt that since I did add some extra interior lighting and a modern stereo it could use the extra ground.