I too go for the heat shield solution. Root problem is probably the copper. It has a pretty good temperature coefficient meaning it changes resistance readily with temperature. That's why, when you see things like a power distribution standard where they talk about a 2% drop for a ......sized wire at a ....... current, the temperature is specified.
Copper gets hot, too much resistance in the circuit, limits the current to the plugs and as a results not enough energy to jump the gap and stay lit long enough to explode the fuel.
Many many times I have seen people with similar time related problems and find it's to the coil getting too hot.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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