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tytho24353yI did a similar migration once, from a static website to a CMS (some 8000+ web pages) it has some decent SEO and although we knew the tags were pretty useless as far as SEO goes, we went ahead migrating them anyway. The site ended up getting a boost from google.
We did the same thing for a smaller site that got about the same amount of traffic, but the developer working on that one forgot to migrate the tags (got everything else, including pretty much the same markup). The site tanked after that because even though the tags didn't give any direct SEO value, it was a way that the page was "fingerprinted", so when they were removed, Google and others thought they were new pages and decided to knock them down a bit because the content had changed too much.
Black Magic, all of it
Chuffed: British detected