Well, then it has to be the distributor, but I don't see how it is that the same 4 plugs are always affected.
Try this: move each wire on the cap one space over, then loosen the distributor and turn it back an 1/8th of a turn. This would be easiest if you make a reference point somewhere. Anyway, do that, and then see which plugs are bad. If it's the same 4, then it's not the distributor, but if the 4 bad ones have shifted over one spot in the firing order, then that clinches it.
Take care,
~Chris
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