Str82u - 11:04 am on Jan 9, 2013 (gmt 0)
No experience with Dreamweaver but FrontPage and Notepad++ have mass find and replace functions. If Google is showing they are 404, it sounds like the links they DID have are no longer valid and may never have been. Can you visit any of those links and see a real content page? It almost sounds like you need to decern between the actual 404 for never-existed pages (404) and those you deleted (410).
how can one convert a nearly 700 page sites links....
manually a nightmare.
@helenp - I hope you aren't having to repeat yourself - Did you mention where Google is finding the links in the "Linked from" section of GWT? Are you able to judge that your site is the cause of most or all of them?
Have you read this? [googlewebmastercentral.blogspot.com...]