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[edited by: Robert_Charlton at 2:57 am (utc) on May 25, 2015]
[edit reason] Removed autolinking [/edit]
I'm not sure from your post and question whether you understand that when changing an http site to https, you would have to 301 redirect all of your urls from http to https for Google properly to handle the change.
You only want one protocol to resolve for each individual page. Both protocols returning a 200 OK header response is dupe content, and https/http dupes can be a mess to clean up.
I added SSL to one of our sites back a few months ago.
I was thinking that Google should be smart enough to understand that's the same site (unlike with subdomains).