Dellorto main jet sizes

Hi all. I’m new to this, but would be very grateful for some help. I have a 350 ducati engine (from an alazzurra) and want to lose the standard filter and replace with K&N style filters. The carb is a PHBH28) What Jet size would you recommend?? (And where to get them from?) Thanks!

You can get jets for del orto carbs from gutsibits.