64fleetside,
Doesn't a rich mixture promote easier spark firing? That is what the choke does.
jfralick,
What are the specs? Plug type, plug gap, plug wire type (are they copper cored wires or new silicon carbon fiber), plug wire resistance, etc.
I would go right back to standard plugs, standard copper plug wires, standard gap on plugs and points, etc.
If you are having a problem, stop trying to reinvent it. The problem isn't going away because you use a different TYPE of plug or plug wires. You are just giving yourself a whole new set of variables to figure out.
Usually the most baffling problems are something relatively simple. If it is a carburetor issue, it will effect all the cylinders reletively the same. If it is a spark issue, it is one component or the whole ignition system will fail. Simplify your thinking.
Have you narrowed it down to the one cylinder being the problem all the time, or does the problem follow the spark plug when you switch it from one hole to the next? That would be a bad plug.
Does the problem follow to a different cylinder when you place the plug wire on a different cylinder? That would be a bad wire. Are they copper core? Are they routed correctly? Is there any other electrical components near a plug wire which could create resistance or ground?
What's the next component in line? The cap (is the housing to the tower cracked? is the contact on the inside not formed correctly?), then the rotor, then the points and their gap.
IS it a new condensor? Try the old one again.
Seldom are the coils the culprit when only one cylinder fails, but check the resistance of the primary and secondaries of the coil.
Let us know what the specifics of your findings.
