Remove the distributor cap again and make sure that the rotor was tightened correctly, it may have seemed tight enough when you fastened everything down, but when driving the vibration of the engine caused things to settle. This happened to me on my Olds, when i tightened the screws on the rotor it seemed tight, but a day or two later it just quit. When i removed the cap, the rotor had come loose, and basically reamed out the inside of the distributor cap thus breaking all the connections with the ignition. replaced them and all was good. I would also double check the connections of the sparkplug wires to the cap....make sure they click when you push them down.
Hope this helps ya
Domino