Version 3.2.0 mp3 should be a straight-forward restore into a new 3.3.1 server.
Since the server is on hardware currently, I would suggest checking the specs against our supported hardware list. Note that this list is all of the systems we have passed through QA, but does not necessarily exclude all other hardware. We simply cannot test on every configuration.
http://www.symantec.com/docs/TECH149007 is the certified list.
There are two basic ways that you can perform a restore. You can either follow the steps from the document bipshr listed above, then import the Organization Key, import the backup, and click on Restore on the backups page, or you can perform a Restore installation. It would be the same steps from the article until step 10, at which point, if you select Restore and click Next, it should prompt you for the backup and the Organization Key.