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Here are some coil specs for ya..........

coil secondary spec is 5.2-8.5Kohm
This is across both high tension terminals


primary is .03- .04 ohm

I have never seen any info on why the early coils did not hold up, but is my thoughts that due to being trapped by engine heat , having to fire accross 2 plugs, poor connectors , and crap wire harnesses, they just didn't have the beef needed for longevity..
I also think the reason plats don't work well [ even the "4's"], is due to the fact that with the 2 plug series circuit, the first plug fires from the electrode to ground, but the second one has to fire from ground back TO the electrode..and the eletrode on plats has a small electrode....so, who knows..
Another reason not to use a larger than spec. gaps on the waste spark system..large gap is doubled with the series circuit [ plug 1 plus plug 2 ]and taxes the coils.........[ many swear they idle better with 1mm gap, but I have not noticed this]
The only saving grace here is that the wasted spark draw is low due to no load/compession, but it still has to jump that second gap............