same here,if your msd dist. cap does not have a vent hole in it drill one.
I drill a 1/4" dia. hole in mine where the original dwell adjustment window is.
my msd uses the stock style cap.
all msd distributors need to vent or they build up massive corrosion on the magnetic pick up fins then it starts to degrade spark signal.
last one I checked had 500 miles on it and looked like it had fungas growing in it. drilled hole in cap, sprayed wd-40 inside cap and its been fine ever since.
i have in all my cars msd rtr. And all are corroded inside like crazy but they working perfect.
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