Dart wont start.

I have a 1973 Dodge Dart Sport, slant 6, that I brought back from Arizona last year. Original AZ car form original owner. It had been running good but today wouldn't start. Just turns over. Tried some starting fluid but no luck. I was wondering about the resister everyone talks about. I think it's on the drivers side of the firewall. Does anyone know what the resistance should be. There are a few cracks in the case and was wondering if that's the issue. Any help is appreciated.