Hmmm, I'd add short to earth to the broken wiring loom line...
Does it run fine stationary at all revs?
Does it run fine if you pull away and remain slow - don't accelerate?
Did you refit the flywheel EXACTLY right? It may be that the wheel is slightly out, but close enough at low RPM for the motor to fire. A the engine speed increases so does the advance, pushing the pickup too far off to work...
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