First thing I would check is whether or not you have power getting to your coil. Also, recheck the point gap just in case the screw that secures the points to the plate wasn't tight enough and let the points move.

If you didn't lubricate the cam lobes on the distributor where the fiber block meets the cam, it wouldn't take long to wear the fiber down.

The points won't care too much about voltage, but they will burn quicker without the resistor either in the line or built into the coil.

My truck shut down the other day, and it took a little digging to find a wire had come off the back of the amp meter.