Get the TT harness, worth the agrivation
factor, especialy since this seems like a
big project for you. You will also need the
16V computer and all sensors to run right.
As far as I know, there is no carb for a 16V
engine, unless there is a custom manifold
made (doubtful) or the 16V was available
in a country other than the US with a carb.
You don't want a carb offroad anyway, flooding
and stalling and stuff, EFI is the way to go
Welcome to the board
Good Luck
Wild