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well, it's been discussed before by many people, i'd suggest searching via the search box for the best way
it was eventually decided upon in one thread that it's best to not store that many pages in your database, it'd be too much data, likely would slow things down noticeably (well, depends...)
one suggestion is to go through all the html pages (a group at a time) getting rid of the html, head, body tags, and create a simple XOOPS module to display the html (if it doesn't already exist)
then index all of the files within the database (store their urls in the database) so that the html is easily accessible via a menu or whatever, and yet loads fast because it's straight html
shouldn't be too difficult if you understand how to work with php
