Battery Relocation Opinions

I'm going to relocate the battery on my heavily modified '56 Plymouth cruiser project to the trunk, mostly for better weight distribution and to make more room for a relay/fuse box under the hood.

Any strong opinions on wire size? It will not be raced, it's a nearly stock 318 with a mini starter and 60amp alternator, and it will not have any equipment that draws a big load.
Author: GaryS