Burnt up Battery

[idahoflywaters]

I acquired this amazing 68 last year and trying to get it started(and stopping) again. I'm a never ever resotoration. I might have burnt up the battery? I put new battery cables in and the ground from the frame that heads to the alternator smoked up and the positive cable to the battery was super hot, hot enough to melt plastic around the terminal. Was this a connection issue or do i need to re-wire the truck?

Thanks