My first boat — 1983 Commander 26

I would get new electric ignition distributors for both. I know points keep things simple but there's enough stuff to mess with on a boat to worry about points. I saw one of those pertonix units on a Landcruiser many years ago but don't know much about them
 
How old is your coil, good shape appearance wise? Any signs of a crack in the plastic? Try swapping between motors.
I have had the small condenser fail but it killed all spark.
The Petronius generally work or do not work. Issue is something else I would say
 
Appreciate everyone’s comments on the spark problem. I’ve swapped the condensers between engines, which didn’t change anything. And checked primary and secondary coil windings resistance, which are correct and the same on both engines. (I also checked for continuity on both coil wires. They were both the same also, but I had no idea that coil wires had such high resistance. An interesting tidbit of new knowledge for me.)

I’m getting a new Pertronics. If it doesn’t solve the problem, I’ll have it on board as a spare.
 
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