Hy 1fletch, the disparity will be things like the number of circuits, original style wire vs modern materials, absolutely stock vs extras, that kind of thing. You can use your original starter on 12 volts if you keep the engine in a good state of tune, so you don't have to crank the snot out of it to get it to start. The generator on the other hand would have to have different field wirings installed, not really worth the money seeing as how there are thousands of 12 volt generators out there that could be installed in place of your 6 volt generator, not to mention about "upgrading" to an alternator, hope that helps.
