On a negative ground system, the coil's (-) terminal goes to ground, as well, through the breaker points.
Your's is backwards, which makes for a slightly less effective spark at the spark plugs.
When the coil's polarity is correct, the leading edge of the spark at the plugs is negative-going. Since the center electrode is hotter than the ground electrode, this makes it easier for the spark to occur, due to the "Edison Effect". (Electrons are emitted better by a HOTTER object better than by a COLDER object.)
On modern vehicles with a "waste spark" system that fires 2 plugs at once, one fires with (-) polarity and the other of the pair fires with (+) polarity, yet the engine runs well 'cause the ignition system has a HOT enough spark to fire even the reversed-polarity plug efficiently.
On your old slow turning, low-compression tractor, the reversed-polarity coil will be a problem only if the spark is marginal to begin with.
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