On Wed, 22 May 2013 11:46:18 -0400, Hank©
wrote:

I wouldn't put money on any of the suggested diagnosis, including mine,
but it would be worth checking out all of them. Most of the coil
overheating problems show visual signs like bulging or oil under the
high tension lead. Carrying a spare would be good insurance.

======

The intermittent coil on my old 454 showed no external symptoms at
all. The engine had failed several times previously after it had been
run for a while but on the last occasion I was able to prove that
there was no spark even though the coil primary showed that the
voltage was being properly interrupted.