Moroso makes some decent kits.
Or you can assemble your own using the appropriate size wire, terminals and a proper battery box. Also get a main kill switch to cut power off, this also requires re-wiring the alternator so that the kill switch functions as it is supposed to, I.E. actually shut the car off when the switch is turned off.
Or you can assemble your own using the appropriate size wire, terminals and a proper battery box. Also get a main kill switch to cut power off, this also requires re-wiring the alternator so that the kill switch functions as it is supposed to, I.E. actually shut the car off when the switch is turned off.