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Your discription sounds exactly what I went through a few weeks ago. I cleaned the plugs twice before replacing them, checking the voltage to the coil, checked for spark, and had fuel but it was only firing on a few cylinders. Finally traced the problem down to a bad Pertronix ignition unit (side note....it's being replaced with an Accel system). Based on what I experienced with my ignition issues, I'd suggest taking another look at your HEI and make sure all of your cylinders are getting spark.
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