Marcus,
The Bosch coil, for whatever reason, seems to run hotter than the lucas coil, but even the Lucas coil runs hot. You should have a good look at your points (yeah, something the EFI people have forgotten) as they will run a higher rsesitance to ground if they are not maring up properly, or if they are partly burned.
A lot of people have opted to use a conventional coil (without the internal ballast resistor) and use an external ballast resistor.
Just the other week, I had a brand new Bosch coil puke it's guts out, all over the back end of my exhaust manifold. Engine wasn't running, but I was fault finding with the key on and the points were obviously closed.
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