[bouncytruck]

Sounds like ignition issues to me. I'd double check all the wiring from the key on. In both of my trucks, the ignition switch went bad and melted the plug into the back of the switch. It took me forever to figure out what was happening to my '69 (put in a new disty, cap, plugs & wires, control modual, rebuilt the carb...), but it was one of the first things I checked when it happened in my '72.