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Well, I am not convinced this is actually an ignition miss….You mention the engine idles and runs at WOT OK…. So, the miss/rough running is occurring at mid range speeds, correct?
Have you checked the throttle cam pick up adjustment? It will run rich at midrange if the cam pick up is retarded, it will sound like an ignition miss….
Keep in mind these engines are not the smoothest running engines, since the recirculation system was added and overboard drains eliminated….I just don’t want to see you spend hours trying to fix an engine that may not be “broken”.
I too, am surprised the engine ran at all with the cam upside down…
Perhaps those two issues will solve your rough running/missing issues….