Some regulations are just Crazy!
In answer to the questions regarding engines. My 2.8 has more than enough power, any more would be pointless (so I wouldn't bother with a 3 or 3.2). I hear the 2.2 is also fine, Tricky could give you more on that.
I went for the 2.8 as the stats were very close to the original V12 - OK it may be missing 6 pots.
The 2.2 may give a closer engine note than the 2.8, while the 2.8 sound great & very retro it is too deep to be the V12.
Tom