How about a duel 6-volt battery setup?
You'll have to figure out where to mount the second battery though.
My dad did that on a 54 Plymouth years ago and the second battery was mounted on the firewall.
Really did emprove winter starts.

BTW, I still have that 54.
Don

Last edited by 2-Ton; 12/31/2017 3:51 PM.
1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!