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Another question then:
The plugs I found in the motor are L77JC4–new looking. According to the "shop evinrude" site the correct plug is QL77J4C. I believe the Q means a resistor plug. There is also a surface gap plug approved: L76V. The black box installed is "Bombardier amplifier assembly" P/N 389550, Wabash Magnetics. I know resistor plugs can play a role in suppressing electrical noise and transients, so am wondering if the "Q" is necessary/important.
I also found this from Champion: ""Outboard marine Capacitive Discharge Ignition systems (CDI) such as used on some Johnson and Evinrude marine engines require a special inductive type resistor spark plug (such as a Champion Q-type). This is because these type of ignitions systems produces less voltage; use of non-inductive type plugs can cause misfires and poor performance."
Guidance from the experts?