Likely, the replacement distributor was from "The Land of Almost Right", and for better or worse those parts are not always "exact" copies of OEM parts.
IMHO, the purpose of vented distributors and/or caps is to allow for an exchange of air decreasing the buildup of corrosive ozone created by electric arcs between the rotor and terminals in the cap..
BTW, are you going to get someone with a scan tool to check out the timing offset?
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