Just to eliminate wires and switches, hot wire the coil right off the battery. I had a friend chase a miss in his race car for two years, turned out to be a faulty ignition switch.
Besides the top bushing, check the drive gear on the distributor if you are willing to pull it out, Pontiac's tend to wear the gear teeth if a non-stock oil pump has been added. I have seen them with 2/3 of each tooth wore off when running the high pressure oil pumps.
Start with the basic's, points, rotor, and cap. You can measure the resistance in the wire if you choose not to replace them, but if they look bad, just swap them as well. You might want to swap a different brand of spark plug to even if they do look good.
Joe
