As a former Wisconsonian, I feel a need to chime in here. After I rebuilt my '49 Chevy truck, it would not start and had many electrical issues in general. After getting correct gauge 6V cables (I got mine from Chev's of the '40s but I expect Filling Station and NCA are just fine too), making sure ALL connections were clean (including where the starter mounts to the motor), and having new ground straps from frame to block, it started like a champ. The 6V systems can work very well if all the parts are right. I did have a decline in how strongly it kicked over when the starting motor was hot. The V-8's have a heat shield to help with this but our sixes don't. If everything else is solid but you still have hot start problems, it may be time to rebuild the starter motor.
Stay with it, work your way through, and you'll end up with a strong starting motor - you betcha!
Good luck with it!