An 8 volt battery is a lousy solution to a nonexistent problem. If your starter, battery, cables, and grounds are in good shape there's no need whatsoever for those extra two volts.
To work right, the regulator must be adjusted to 9.5 volts, which burns out points, fries headlight and tail light bulbs, and is rough on the generator and the regulator. The generator voltage has to be high enough to force a charge into the battery. Normal generator operating voltage on a 6 volt system is 7.5 volts, so it can't recharge an 8 volt battery without readjusting the regulator. 8 volt batteries were a lousy idea 50 years ago when I was learning to do auto electricity, and that hasn't changed at all!
Jerry
