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If you can find an older mechanic that still has the old scopes they used in the late 1970's and 1980's, they could pin point your problem quite quickly, if it is ignition.
Also if you have an older school electrical guru friend, with an oscilloscope, you could track it down.
I have to admit, I have always been quite fond the the GM HEI distributor. If you do go to a different distributor, make sure the gear material is compatible with your cam. Many horror stories here.
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