If you plan on ever showing up at an NHRA track, you might want to get a copy of their rules and heed them. If you don't plan on a disconnect, I'd say
use the biggest cable you can find---welding cable will do, and be careful how you route it and use appropriate grommets and other abrasion protection
Either find an overboard vent system or buy a gel/ other "ventless" battery, make sure it's adequately fastened down.
Use a light ga. aluminum ground so you have a "fuse."
Make sure you add a BIG jumper from the block to the body for ground continuity