Ducati 998r engine info needed in a 916

Hi all...
As some of you may remember i rebuilt my 916 in to the white framed corse 916, with the intention of putting a 1198/1098 engine in to it in the near future.
Thread of rebuild.. http://www.ducati.ms/forums/56-superbikes/130347-duke-916-strip-down-re-build.html

Out and about today visiting some local breakers and chatting to a few people along with a bacon sarnie thrown in, i came a across a bloke who has a 998R engine which he may sell me.
The engine is complete with starter etc...
The bloke is looking for at least £1000 for it.
He said he's been holding on to it for a project,but never done anything with it.

Given the amount of work to fit a 1198 engine in the duke (which im prepared to do), What would be needed to get the 998r engine in the 916 frame, extra mods,info ?
Also what sort of performance difference would there be ? (not knowing about the R spec :/ )

Many thanks !

Richard