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First of all, this engine does not tolerate aluminum contacts in the distributor cap. They oxidize quickly, as evidenced by the white powder that is found on them. So the cap has to be one with brass inserts.

Next, I replace the ignition rotor every 15K miles, because they char more readily these days. You might get away with 25K miles, but at that point I replace the rotor, cap, plugs and wires. If there are more miles on them than that, it's the most likely cause of poor spark.

Also make sure that the ignition wires don't cross and touch each other or the valve cover, as that can cause misfires. There are plastic wire guides to prevent this.
 
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