While having the coil primary properly connected is a GOOD thing, it's not making for his hard starting problem.
Actually, coil primary polarity actually has NO effect on starting when the spark plugs' center electrodes and ground electrodes are BOTH at ambient temperature.
Proper coil/spark polarity DOES matter when the engine is running and the center electrode of the spark plugs is HOTTER than the ground electrode.
You want a negative-going leading edge to the spark as the the HOTTER center electrode of the plug is a better emitter of electrons than the COOLER ground electrode due to the Thermionic Effect (Edison Effect).
Improper spark polarity CAN cause a missfire under lean or WOT conditions when the ignition system is marginal and needs all the help it can get.
As a side note MANY modern vehicle ignition systems are of the "waste spark" variety where one coil fires two sparkplugs, one with the desired polarity and the other with reversed polarity.
Yet, the engines run well 'cause the ignition system is designed to produce a "hot" enough spark to fire a plug at either polarity.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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