wire size for high amp alternator

I got my new denso 130 amp alternator today. I'm going to put it on my 68 cuda and run new wiring (skipping the amp guage) and also a ground wire all the way back to the battery in the trunk. Is there a formula for how big the wires should be for x amount of feet and x amount of amps ? Or just what's everybody else using ? Any advice would be appreciated.