Maybe some more history, how long have you owned the car? Has this been a problem since you've owned it or did it suddenly develop last fall?

Well you replaced the plugs, plug wires and coil. What about the distributor cap and rotor? Sometimes the cap will develop a carbon track and the juice will follow the track resulting in a miss fire.

Try putting the timing light on the other plug wires to check if they are firing intermittently as well. If all the plugs are firing correctly except number one I would suspect the plug, wire or cap/rotor. If they are all firing intermittently I would suspect the plugs, wires, rotor/cap and module. Although I've found the module either works or doesn't. But if you have replaced the plugs, wires and coil you can concentrate on the cap and rotor or the wiring to the distributor.

Is the distributor an HEI? If so it will require 12-14.5 volts to operate correctly. If originality is not and issue I suggest installing a relay/solenoid to power the distributor.
Use the ignition switched wire to turn the solenoid off and on and power the distributor through the solenoid from the battery or the alternator.

If the car has to look original you may have to replace the wire powering the distributor from the ignition switch. Originally they were a resistor wire and only supplied the points distributor with about nine volts after it started.

The condition of the wires and connections may be the fault as well. Any corrosion at a connection will result in a voltage drop across the connection/splice. If the wiring to the distributor has some crimped butt splices, that could be the source of the voltage drop. Better to crimp, solder then heat shrink the joints.