1.8 16v on weber twin 40's, What jets will i need?

Hi people

As above i need to know the correct size jets i need to run on my 1.8 16v KR, also im running a 4 branch if that makes any difference to wat jets il need to run, also wat size choke tubes will be needed? and also wat emusions? Need this info desperate as i need to order them for the weekend if poss,

also could you please put it into english as im not to clued up with this, but hey u gota start somewhere

Thanks in advance

   TOM