In my mind all Suzuki carbs are crap. Over complicated, impossible to tune,Un-fixable.
SU carb needs 90 degree adaptor making, which ideally needs heating otherwise can lead to fuelling problems on cold interior wall of adaptor.
Allegedly Hyundai pony carb goes on, Nikki carb only needs a flat raiser plate making, and weber is not far behind for ease of fitment.
Get a Nikki, I ran one for ages and loved it, maybe coughs a bit on steeeeep hills/sideslopes but otherwise OK.
Whatever you do, ensure all the little brass air fittings on the carb manifold are blanked off/folded over, or youll be blaming your new carb for the air leaks.