used to have a DOS software which helps calculate recommended jet/choke sizes for twin carburettors for any 4 cylinder engine
all u need to input is engine size, and when peak power occur @ which rpm
then what i did was find new chokes, and bought jettings as recommended, but bought slitely larger/smaller just in case
fitted them (and the dcoes) and the tuner got the car purring like a kitten after 10-15 minutes
however main jet was slitely too small as i was running lean up top, so swapped those for one size larger jets which are in there till today
and that was it, set it and forget
there are quite many weber users in Saga Iswara Club
local carb scene really not quite as bleak/glum/dark as you make it out to be hehe