If you wanted to play with dwell, I would try decreasing it from 37 degrees (IIRC) to increase the gap. Of course, that will retard the timing some so it still may not run right.

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"