The problems from that point are limited. Outside of a damaged rotor or cap, the damage present may also be in the form of cracking. The rotor may be incorrectl for the application and not timed correctly to transfer the spark, compare it to the old one. Moisture is one of the more common problems check closely for this. There is also a phenomena called ..carbon tracking.. where during use the environment in the distributor cap collects carbon and this forms a fine trail inside the cap that can form in a line down to the mating face of the metal distributor base. The spark then follows that trail to ground. Look closely, the use of a magnifying glass would not be out of the question. The wires themselves could also not conduct the spark properly. Did the wires come made to the proper length? If they were cut to fit the end of the wire needs about a 1/2 of insulation stripped away leaving the core conductor. Then the conductor need folded back over the insulation then the terminal end needs crimped over the top of the folded conductor. I would suggest now that you confirmed spark at the coil wire check it at the plugs again. It could be that there is an intermittent problem in your ignition and the spark comes and goes. The best way is to put a wire on a plug and place the plug against some metal part of the block and crank it looking for spark. Give a description of how you checked for spark at the plugs. What do the plugs look like? Do they still look like new? Has the tractor attempted to run at all since the new plugs were put in? If the plugs are black they are what I call rich fouled. They will need cleaned with spray carb cleaner, a wire brush then a blast of compressed air.
I was ready to post to add that the other poster that gave you the testing info left out a very important component of a coil and point type ignition system test. You confirmed it is working by testing for spark at the high tension coil wire. Before condemning a coil his test should have included that when the points are closed there should be no indication of power on the terminal that comes out of the distributor. The points when closed or contacting should ground or connect it to earth as you like to say. So when working correctly the distributor terminal should flash or blink a test light on and off with its lead connected to earth and the test probe on the terminal when the ignition is on and working correctly and you are cranking the engine. I am going to give you a very thorough test process for a points ignition system. It was put together by a very knowledgeable poster here on YT posting under the handle John T. Good luck!
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