Fried battery cables?
 

Hi I'm Chad,

Awhile ago I hit a nasty bump on my first gen 81 and the battery's bracket wasn't tight so the tall battery hit the underside of my hood and burned the negative cable's rubber off. I jumped it after re-attaching my negative cable and it was fine, about a week later I was on the way to my house and the car started jumping violently in second gear then it stalled so I tried starting it again but I lost all power. I coasted to my house and looked at it in the morning and my battery had slid into the engine bay and was leaning just under the distributor cap. I picked it back up and connected the wires again and turned the key to accessory and the lights went on, I turned it off and constructed a small bracket to keep it from jumping around just a metal strip over the top and around the sides, I went to turn it over but there was no power, I checked my fusible link and it's fine so I changed the battery but still no power. My guess is my positive cable and negative cable are either fried or shorting out so I plan to replace them, can you guys think of something else that would be causing this? It's just strange that the cables would give out all of a sudden. I feel that the jumping in second gear was premature chamber detonation from the battery arcing to the block and per-detonating the sparkplugs. What's your two cents?