The latest Inferno Shoutbox works just fine on 3.8, if you do a search you will find it. No need to seek a newer version when the last works.
On a side note this is not the right place to make requests, there is a request section for that, even if it wasn't an unnecessary request. Next time make requests here, http://www.vbteam.info/req-addons-template-modifications/
for requests of this type.
