Lance, i ran MSD in my racing days, and I'll tell you, I always had a spare one in the hauler, wired up with quick connector, ready to go. I can honestly say that I had more MSD box failures, than I had flat tires, in all the years I raced. If I were you, I'd get a spare box, and have it ready to go.
I ran the 6ALN box, which never really got hot. I'm not sure about the particular box you have, as far as heat goes, but I'd think that there would be ventilation in the kick panel area? I don't feel that vibration or harmonics should be an issue from the plastic panel. If you strapped it directly to something metallic, that would be a different sermon. I like what your doing with your car this winter.
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