[my56chevytruck]

Matt,
This is a question I asked when redoing my 56, stepside, and there were multiple pros and cons to just about every location. I chose to remove the battery from the firewall, only to have a cleaner look when looking at the engine compartment, but I got some boos when I said, "behind the seat". Just make sure the battery box is a good one and is secured to the floor. So, you choose what is the best location, my reasoning is I want access to mine and a good looking engine compartment, my opinion solely.