In addition to the carb issues, David also suspected there was an ignition issue caused by poor EM shielding. He suspected this because of these clues:
-Erratic tach
-Erratic timing light behavior
-Odd markings in the 1-4 distributor cap
-1-4 bank plugs simply don’t look as nice as 5-8
bank
With the newly repaired carbs installed (again), new 1-4 bank distributor cap, and higher quality ignition wires, the problems seem to have gone away. The tach is glass smooth, plug cuts look a lot better and now on to final tuning (again).
As David says, “90% of carburetor issues is ignition." In this case, sounds like it was about 50:50.
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