I've had the 6al box in my '67 for a few years. Just recently, I've started having problems.
A few days ago, when I tried to start the thing, the starter just spins and there's no ignition. I got out my test light, turned the key to the on position, and there's no fire at the coil. A few days later I went out and checked for fire at the coil, and there was. Then it started right up. So I drove around for 20 minutes or so, and it died. Got out the test light, and again there's no fire at the coil.
So right now I'm thinking there's a loose connection in the box, possibly caused by corrosion due to condensation?
Before I pull it apart and look at it, I'd like to get some feedback from anyone who might have had this problem.