I'm coming to the conclusion that I will likely have to install the battery in the rear of the '57 Nomad that I'm building.. and I have some questions that some of you have experience with and might help?

1) For the typical rear mounted battery in a '57 wagon (Nomad), how long will the battery cables need to be? Is 10 ft sufficient to get from the starter solenoid (or an LS engine) to the rear of the RHS wheel well??
2) What size cable (stranded copper I assume) is needed to support the current required with minimal voltage drop? Is 2 gauge sufficient?
3) Is it necessary to run both pos and neg cable from the engine compartment to the battery? Or can the frame be used for the ground/return??

The last time I did a rear-mount battery was in 1971 when I did so in a Henry J I was building, and I used '00' welding cable, which was likely significant overkill... Any suggestions/help is appreciated.