You would be closer to optimum air/fuel ratio with proper jetting. You would have a broader power curve and just better performance in general. Dinqua's site has good info, try here maybe http://www.bonnevilleamerica.com/dinqua/Triumph/carbs0.html Mapping mostly applies to the EFI models. Although you can have your ignition timing changed, TPUSA & TTP offer that service I think.

09 America, some modifications