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Welcome to the McCullochs From Hell club!
Your motor sounds like the twelve horse I’ve been working on and off for the last few years. It also has new OMC/BRP coils but I installed Atom modules to eliminate the points. After months of frustration, I discovered one of the points terminals was loose and could be turned around on its base causing erratic spark. I have new sets of points now so when I get desperate for something to do, I’ll pull the Mac out and install them. Also, double check or replace the plug wires and remove and clean the plug terminals. The wires can be broken internally which will give a good ohm reading but can’t pass enough current to fire the plug. A poor connection from the spring terminal to the wires core will do the same thing.